> > Biology MCQs > Genetics MCQs

Genetics MCQ

Genetics

1. The __________ stops materials from moving between cells across an epithelium.

Columnar

Gap junction

Occluding junction

Connective tissue

Answer

Correct Answer: Occluding junction

Note: This Question is unanswered, help us to find answer for this one

2. Transcription normally stops when the _____.

RNA polymerase reaches a termination signal on the DNA that leads to the formation of a hairpin loop in the mRNA

Bacteria and eukaryotes rely on proteins that recognize specific DNA sequences in the promoter to initiate transcription.

Transcription from certain bacterial genes would be reduced or eliminated.

The promoters are more diverse and the primary RNA transcript must be extensively processed

Answer

Correct Answer: RNA polymerase reaches a termination signal on the DNA that leads to the formation of a hairpin loop in the mRNA

Note: This Question is unanswered, help us to find answer for this one

3. In the diagram below, the two blue strands represent _____.

RNA

DNA

Transcription factors

RNA polymerase

The promoter

Answer

Correct Answer: DNA

Note: This Question is unanswered, help us to find answer for this one

4. In rna the nitrogenous base uracil pairs with ______ in dna

Adenine

Uracil

Cytosine

Guanine

Answer

Correct Answer: Adenine

Note: This Question is unanswered, help us to find answer for this one

5. In general, the phenotypes of a complex trait should exhibit a(n) _____ distribution.

Complex

Normal

Skewed

Inverted

Bimodal

Answer

Correct Answer: Normal

Note: This Question is unanswered, help us to find answer for this one

6. In evolutionary terms, an organism's fitness is measured by its _____. see concept 23.4 (page 495)

Genetic variability

Health

Stability in the face of environmental change

Mutation rate

Contribution to the gene pool of the next generation

Answer

Correct Answer: Contribution to the gene pool of the next generation

Note: This Question is unanswered, help us to find answer for this one

7. The cross-fertilization of two different varieties of pea plants will produce a(n) _____.

Generation

Lethal

Hybrid

Generation.

Answer

Correct Answer: Hybrid

Note: This Question is unanswered, help us to find answer for this one

8. The bottleneck event that decimated the bison was caused by _______.

Overhunting

Climate change

Disease

Habitat destruction

Answer

Correct Answer: Overhunting

Note: This Question is unanswered, help us to find answer for this one

9. Polydactylism occurs _______.

Only in cats

Only in humans

In less than one in 1000 children

More commonly in certain populations, ...

Answer

Correct Answer: Only in cats

Note: This Question is unanswered, help us to find answer for this one

10. Point mutations in noncoding regions of dna result in __________.

Population variation

Gene duplication

Directional selection

Neutral variation

Answer

Correct Answer: Neutral variation

Note: This Question is unanswered, help us to find answer for this one

11. The enzyme that accomplishes transcription is termed ______.

DNA polymerase.

RNA polymerase

DNA ligase.

RNA ligase.

RNA replicase.

Answer

Correct Answer: RNA polymerase

Note: This Question is unanswered, help us to find answer for this one

12. In drosophila, the ratio of x chromosomes to autosomes directly influences _______.

SXL late protein production

The ratio of sisterless protein subunits to deadpan protein subunits

Repression of sex-specific genes

RNA splicing patterns

Answer

Correct Answer: The ratio of sisterless protein subunits to deadpan protein subunits

Note: This Question is unanswered, help us to find answer for this one

13. Removal of ____ turns genes off.

Enzymes

Histones

Esters

Acetyl groups

Answer

Correct Answer: Acetyl groups

Note: This Question is unanswered, help us to find answer for this one

14. Red-green color blindness and _____ are known to be inherited as x-linked recessive traits.

Hemoglobin

Hemophilia

Anemia

Pleiotropy

Answer

Correct Answer: Hemophilia

Note: This Question is unanswered, help us to find answer for this one

15. Recessive alleles are best defined as ________.

A deleterious or disease causing allele

The least frequently expressed allele in a given population

Only expresses in present in a double dose

A weakened or attenuated allele

Answer

Correct Answer: Only expresses in present in a double dose

Note: This Question is unanswered, help us to find answer for this one

16. A homozygous dominant germ cell undergoes meiosis. the gametes will _________________________.

Only have the dominant allele

Have both the dominant or the recessive allele

Either have the dominant or the recessive allele

Only have the recessive allele

Answer

Correct Answer: Only have the dominant allele

Note: This Question is unanswered, help us to find answer for this one

17. A family tree that describes traits in families is called a __________.

Punnett square analysis

Pedigree analysis

Quantitative character

Qualitative character

Standard deviation

Answer

Correct Answer: Pedigree analysis

Note: This Question is unanswered, help us to find answer for this one

18. In 1859, naturalist ______________ suggested an explanation for why evolution occurs.

Robert McKormick

Charles Darwin

Charles Lyell

Thomas Malthus

Answer

Correct Answer: Charles Darwin

Note: This Question is unanswered, help us to find answer for this one

19. If someone says "there is a flu epidemic", this is analogous to saying ______.

There is a flu outbreak

Epinephrine

CAUTI

Journal of Advanced Nursing

Answer

Correct Answer: There is a flu outbreak

Note: This Question is unanswered, help us to find answer for this one

20. Identical twins occur when a(n) ____ divides to form two separate, individual cells.

Gene

Gamete

Fertilized ovum

Autosome

Answer

Correct Answer: Fertilized ovum

Note: This Question is unanswered, help us to find answer for this one

21. Bacterial plasmids are of particular interest to biotechnologists because plasmids __________.

Make many copies of a specific DNA

Can deliver DNA to other cells

Stop codon in the mRNA is reached

Provide a site for tRNA to bind to mRNA

Answer

Correct Answer: Can deliver DNA to other cells

Note: This Question is unanswered, help us to find answer for this one

22. Animal bodies are organized along the ____________ axes.

Dorsoventral

Anteroposterior

Left-right

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

23. The overall error rate in the completed dna molecule is approximately __________.

1 error per 1,000 nucleotides

1 error per 1,000,000,000 nucleotides

1 error per 1,000,000 nucleotides

1 error per 100 nucleotides

1 error per 10,000,000,000 nucleotides

Answer

Correct Answer: 1 error per 10,000,000,000 nucleotides

Note: This Question is unanswered, help us to find answer for this one

24. When fisheries managers move fish from one lake to another, this causes gene ______.

Flow

Blending

Mutation

Dominance

Answer

Correct Answer: Flow

Note: This Question is unanswered, help us to find answer for this one

25. We can better understand our ancestry by analyzing the __________ in males.

Fetal testes

Autosomes

Mesonephros

Y chromosome

Answer

Correct Answer: Y chromosome

Note: This Question is unanswered, help us to find answer for this one

26. Transcription and replication occur during ____________________ of the cell cycle.

Prophase

Metaphase

Interphase

Anaphase

Answer

Correct Answer: Interphase

Note: This Question is unanswered, help us to find answer for this one

27. The secondary form of inheritance via epigenetics is sometimes referred to as ______ inheritance.

Accelerates a chemical reaction in a cell

Environmental effects.

Punnett square

Codominance

Answer

Correct Answer: Accelerates a chemical reaction in a cell

Note: This Question is unanswered, help us to find answer for this one

28. The mc1r gene________________. choose all that apply.

¾ = 0.75 = 75%

2/3 = 0.66 = 66%

½ = 0.5 = 50%

¼ = 0.25 = 25%

3/16 = 0.1875= 18.75%

Answer

Correct Answer: 3/16 = 0.1875= 18.75%

Note: This Question is unanswered, help us to find answer for this one

29. The inheritance of height and weight can best be described as __________.

Simple dominant-recessive inheritance

Being caused by microorganisms

Polygenic

A trait that does not follow the rules of Mendelian inheritance

The results of a bad lifestyle

Answer

Correct Answer: Polygenic

Note: This Question is unanswered, help us to find answer for this one

30. The first basic idea of evolutionary adaptation can be traced back to _____.

Ancient Greeks about 2,500 years ago

Aristotle

Lamarck

Darwin.

Answer

Correct Answer: Lamarck

Note: This Question is unanswered, help us to find answer for this one

31. Telomerase is fully active in ___ and _ cells, but almost completely inactive in ___ cells.

Germ; stem; somatic

Somatic; germ; stem

Germ; somatic; stem

Stem; blood; germ

Answer

Correct Answer: Germ; stem; somatic

Note: This Question is unanswered, help us to find answer for this one

32. Sexual recombination includes the shuffling of chromosomes in __________ and fertilization.

Mutation

Genetic drift

Natural selection

Meiosis

Mitosis

Answer

Correct Answer: Meiosis

Note: This Question is unanswered, help us to find answer for this one

33. Natural selection generally results in ________.

Increased genetic variation

A population that is better adapted to a future environment

A population that is adapted to its current environment

An increase in the size of a population

Answer

Correct Answer: A population that is adapted to its current environment

Note: This Question is unanswered, help us to find answer for this one

34. Mutation is the only evolutionary mechanism that _____.

Descent with modification

Natural selection

The population size is small

Does little to change allele frequencies

Answer

Correct Answer: Does little to change allele frequencies

Note: This Question is unanswered, help us to find answer for this one

35. A(n) _______ is a characteristic arising from genes located on gender-determining chromosomes.

Autosomal trait

Genotype

Allele

Sex-linked

Answer

Correct Answer: Sex-linked

Note: This Question is unanswered, help us to find answer for this one

36. Gene expression involves two phases, ___________ and translation.

Replication

Transcription

Initiation

Condensation

Answer

Correct Answer: Transcription

Note: This Question is unanswered, help us to find answer for this one

37. Fetal cells may be removed along with fluid from the womb by a process known as __________.

Karyotyping

Testcrossing

Ultrasound

Chorionic villus sampling

Amniocentesis

Answer

Correct Answer: Amniocentesis

Note: This Question is unanswered, help us to find answer for this one

38. A pedigree chart like this one is characteristic of _________________ disorders.

Dominant allelic

Autosomal recessive

Sex-linked dominant

Sex-linked recessive

Answer

Correct Answer: Sex-linked recessive

Note: This Question is unanswered, help us to find answer for this one

39. A mutation that knocked out the proofreading function of dna polymerase would result in __________.

A higher-than-normal rate of DNA synthesis errors

Leading and lagging strands

Origin of replication

Primase

Answer

Correct Answer: A higher-than-normal rate of DNA synthesis errors

Note: This Question is unanswered, help us to find answer for this one

40. Closed chest injuries are typically caused by _______.

Penetrating trauma

High-velocity weapons

Blunt trauma

Flying debris

Answer

Correct Answer: Blunt trauma

Note: This Question is unanswered, help us to find answer for this one

41. When a baby is born, the zygote has become about _____ billion cells.

Answer

Correct Answer: 26

Note: This Question is unanswered, help us to find answer for this one

42. Tafs _ and _ make contact with the initiator region of the promoter.

5 and 9

12 and 4b

6 and 9

1 and 2

Answer

Correct Answer: 1 and 2

Note: This Question is unanswered, help us to find answer for this one

43. A qtl is a __ where one or more genes affecting a quantitative trait are .

Site in a cell, located

Site in a chromosome, located

Site in a cell, expressed

Site in a chromosome, expressed

Answer

Correct Answer: Site in a chromosome, located

Note: This Question is unanswered, help us to find answer for this one

44. Strand discrimination during the process of _____________ is based on dna methylation in e. coli.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

45. A(n) _____ that carries the chromosomes x and y is male, and one with two x chromosomes is female.

Egg

Zygote

Nuclei

Sperm

Answer

Correct Answer: Zygote

Note: This Question is unanswered, help us to find answer for this one

46. The sum of histone modifications and their interactions is called the ________.

Genetic code

Transcription code

Protein code

Expression code

Histone code

Answer

Correct Answer: Histone code

Note: This Question is unanswered, help us to find answer for this one

47. Evolutionary psychologists are most directly concerned with the impact of ________ on behavior.

Peer influence

Gender schemas

Collectivism

Genetic predispositions

Answer

Correct Answer: Genetic predispositions

Note: This Question is unanswered, help us to find answer for this one

48. Epigenetics is the study of environmental influences on ______ that occur without a dna change.

Natural selection

Gene expression

Brain plasticity

None of above

Answer

Correct Answer: Gene expression

Note: This Question is unanswered, help us to find answer for this one

49. Translation is directly dependent on all of the following associations except _______.

Complementary base pairing between mRNA and rRNA

Complementary base pairing between mRNA and DNA

Association of the 30S and the 50S ribosomal subunits

Complementary base pairing between mRNA and tRNA

Answer

Correct Answer: Complementary base pairing between mRNA and DNA

Note: This Question is unanswered, help us to find answer for this one

50. Conserved developmental genes can lead to _______ evolution.

Divergent

Convergent

Parallel phenotypic

Linear

None of the above

Answer

Correct Answer: Parallel phenotypic

Note: This Question is unanswered, help us to find answer for this one

51. Expression of ______ would inhibit x-inactivation.

Xic

Xist

Tsix

All of the answers are correct

Answer

Correct Answer: Tsix

Note: This Question is unanswered, help us to find answer for this one

52. Chi-square analysis can help us to decide whether __________.

A hypothesis is correct

Our experiment was conducted properly

Our results for an experiment are correct

Our observations of an event differ from our expectations

Answer

Correct Answer: Our observations of an event differ from our expectations

Note: This Question is unanswered, help us to find answer for this one

53. Small noncoding rnas (ncrnas) called piwi-interacting rnas, or pirnas, __________.

Modify histones

Induce the formation of heterochromatin and block the expression of movable DNA elements called transposons

Induce shorter mRNA expression by reducing introns

Induce the formation of euchromatin and block the expression of movable DNA elements called transposons

Enhance transposon expression

Answer

Correct Answer: Induce the formation of heterochromatin and block the expression of movable DNA elements called transposons

Note: This Question is unanswered, help us to find answer for this one

54. Research on laboratory animals indicates that cannabinoids are most effective if taken ____.

As soon as the stroke occurs

Within 20 minutes of the stroke

Steadily for one month

Shortly before the stroke

Answer

Correct Answer: Shortly before the stroke

Note: This Question is unanswered, help us to find answer for this one

55. Viral chromosomes exist in a variety of conformations and can be made up of ________.

protein- or lipid-coding sequences

DNA only

DNA or RNA

RNA only

Answer

Correct Answer: DNA or RNA

Note: This Question is unanswered, help us to find answer for this one

56. The production of gene families, such as the globin genes is the result of ________.

Gene duplications.

Polypeptides

Telomeres

Centromeres

Answer

Correct Answer: Gene duplications.

Note: This Question is unanswered, help us to find answer for this one

57. The lac operon is optimally expressed _____.

When lactose is present and glucose is absent.

In the presence of lactose and the absence of glucose

Results from the formation of trp mRNA secondary structures

None of these

Answer

Correct Answer: In the presence of lactose and the absence of glucose

Note: This Question is unanswered, help us to find answer for this one

58. The genetic code is said to be triplet, meaning that there ________.

Are three

May be three ways in which an amino acid may terminate a chain

Are three bases in mRNA that code for an amino acid

Are three amino acids per base in mRNA

Answer

Correct Answer: Are three bases in mRNA that code for an amino acid

Note: This Question is unanswered, help us to find answer for this one

59. Most e. coli antisense rnas work with a protein called ______ to regulate their target mrnas.

CAP

MicF.

Hfq

None of the choices are correct.

Answer

Correct Answer: Hfq

Note: This Question is unanswered, help us to find answer for this one

60. A major difference between mendelian and quantitative traits is in _______________

Small differences between average phenotypes compared to differences between individuals within genotypes.

Large differences between average phenotypes compared to differences between individuals within genotypes.

That statistical properties of Mendelian traits are better understood.

That statistical properties of quantitative traits are better understood.

There are no differences between them

Answer

Correct Answer: Small differences between average phenotypes compared to differences between individuals within genotypes.

Note: This Question is unanswered, help us to find answer for this one

61. Contracts involving fraud in inducement are ________.

Valid

Void

Voidable

Non-rescindable

Answer

Correct Answer: Voidable

Note: This Question is unanswered, help us to find answer for this one

62. In traditional cultures, prenatal massage __________.

Passive genotype → environment effects

Has beneficial effects for both mother and fetus

Be a female who will later experience problems in the development of the reproductive system

Had rubella

Answer

Correct Answer: Has beneficial effects for both mother and fetus

Note: This Question is unanswered, help us to find answer for this one

63. Anticodons, codons, and base triplets correspond to __________ respectively.

Dna helicase; dna Polymerase

Genes; proteins

TRNA, mRNA, and DNA

Mrna codons; 20 amino acids

Answer

Correct Answer: TRNA, mRNA, and DNA

Note: This Question is unanswered, help us to find answer for this one

64. In terms of its involvement in mutagenesis, 5bu is best described as _______.

A base analog that can cause either A-T > G-C or G-C > A-T transitions

DNA with incorporated 5BU must replicate.

These dimers distort the DNA structure and result in errors during DNA replication.

All of these

Answer

Correct Answer: A base analog that can cause either A-T > G-C or G-C > A-T transitions

Note: This Question is unanswered, help us to find answer for this one

65. After translation, a protein may undergo structural changes called __________ modifications.

Ribosomes

Interphase

Posttranslational

Anaphase

Answer

Correct Answer: Posttranslational

Note: This Question is unanswered, help us to find answer for this one

66. Pedigrees and blood tests are both means of __________.

Carrier recognition

Four

Deletion

Phenotypic

Answer

Correct Answer: Carrier recognition

Note: This Question is unanswered, help us to find answer for this one

67. The y chromosomes of mammals contain genes that code for _____.

Eye pigment, among many other characters

They are on the same chromosome

"maleness" and a few other characteristics

50% of sons and 50% of daughters

Answer

Correct Answer: "maleness" and a few other characteristics

Note: This Question is unanswered, help us to find answer for this one

68. In a monohybrid cross, f2 refers to __________.

the second filial generation, or the "grandchildren" of the original mating pair

Peas

An organism with two different alleles for a single trait is said to be homozygous for that trait.

None of these

Answer

Correct Answer: the second filial generation, or the "grandchildren" of the original mating pair

Note: This Question is unanswered, help us to find answer for this one

69. According to current evidence, pluto is best explained as ______.

A large member of the Kuiper belt

A meteorite

Pea

None of this

Answer

Correct Answer: A large member of the Kuiper belt

Note: This Question is unanswered, help us to find answer for this one

70. During the highlighted phase of mitosis, the chromosomes are ________.

Moving away from each other toward opposite poles of the cell

Aligned in the center of the cell

Returning to chromatin form

Attaching to mitotic spindle microtubules at the centromere

Answer

Correct Answer: Moving away from each other toward opposite poles of the cell

Note: This Question is unanswered, help us to find answer for this one

71. Dns poisoning _____.

Floods a DNS server with requests until it can no longer respond

Is rarely found today due to the use of host tables

Substitutes DNS addresses so that the computer is automatically redirected to another device

Is the same as ARP poisoning

Answer

Correct Answer: Substitutes DNS addresses so that the computer is automatically redirected to another device

Note: This Question is unanswered, help us to find answer for this one

72. Dna polymerase i is thought to add nucleotides ________.

To the 5' end of the primer

To the 3' end of the primer

In the place of the primer RNA after it is removed

On single-stranded templates without need for an RNA primer

Answer

Correct Answer: In the place of the primer RNA after it is removed

Note: This Question is unanswered, help us to find answer for this one

73. Hfr strains contain the f factor integrated into their , rather than in the __.

Chromosome; cytoplasm

Chromosome; chloroplast

Chromosome; mitochondrial DNA

Cytoplasm; chromosome

Answer

Correct Answer: Chromosome; cytoplasm

Note: This Question is unanswered, help us to find answer for this one

74. Whenever diploid populations are in hardy-weinberg equilibrium at a particular locus, _____.

The allele's frequency should not change from one generation to the next

Natural selection, gene flow, and genetic drift are acting equally to change an allele'sfrequency

Two alleles are present in equal proportions

Individuals within the population are evolving

Answer

Correct Answer: The allele's frequency should not change from one generation to the next

Note: This Question is unanswered, help us to find answer for this one

75. If mom's genotype is bb, her eggs will be ______.

Half B and half b

Phenotype

Transcription

None of this

Answer

Correct Answer: Half B and half b

Note: This Question is unanswered, help us to find answer for this one

76. When two genes fail to assort independently, the term normally applied is ________.

Discontinuous inheritance

Mendelian inheritance

Linkage

Tetrad analysis

Dominance and/or recessiveness

Answer

Correct Answer: Linkage

Note: This Question is unanswered, help us to find answer for this one

77. The bonds that hold trna molecules in the correct three-dimensional shape are __________.

Covalent bonds

Peptide linkages

Hydrogen bonds

Ionic bonds

Hydrophobic interactions

Answer

Correct Answer: Hydrogen bonds

Note: This Question is unanswered, help us to find answer for this one

78. In eukaryotic cells, transcription cannot begin until _____.

*Exons are cut out before mRNA leaves the nucleus.

*It extends from one end of a tRNA molecule.

*a single nucleotide insertion downstream of, and close to, the start of the coding sequence

*several transcription factors have bound to the promoter.

Answer

Correct Answer: *several transcription factors have bound to the promoter.

Note: This Question is unanswered, help us to find answer for this one

79. If you are a male, the law of independent assortment indicates that your gametes contain _____.

A random mix of the chromosomes you inherited from each ...

A is one particular variation of a character

Most human genes come in alternative versions called

The scientific study of heredity

Answer

Correct Answer: A random mix of the chromosomes you inherited from each ...

Note: This Question is unanswered, help us to find answer for this one

80. You conduct a dihybrid cross. a ________ ratio would make you suspect that the genes are linked.

9:3:3:1

3:1

12:1:1:4

1:1:1:1

Answer

Correct Answer: 12:1:1:4

Note: This Question is unanswered, help us to find answer for this one

81. With incomplete dominance, a likely ratio resulting from a monohybrid cross would be ________.

3:3.

1:2:2:4.

1:2:1.

9:3:3:1

Answer

Correct Answer: 1:2:1.

Note: This Question is unanswered, help us to find answer for this one

82. The result of the following cross indicates the orange eyes are _____ black eyes

Are all Rr

Gametes, progeny

Recessive too

Answer

Correct Answer: Recessive too

Note: This Question is unanswered, help us to find answer for this one

83. The mutation that resulted from her accident was probably ______.

One that changed the triplet grouping of the genetic message.

The RNA that is translated into polypeptide is

HIV must use its own reverse transcriptase to produce

A prophage is a bacteria as a provirus is to animal cells

Answer

Correct Answer: One that changed the triplet grouping of the genetic message.

Note: This Question is unanswered, help us to find answer for this one

84. The evolutionary effects of genetic drift are greatest when _____

The population size is small.

Mendelian inheritance

Hardy weinberg equilibrium

Hardy weinberg principle

Answer

Correct Answer: The population size is small.

Note: This Question is unanswered, help us to find answer for this one

85. If a trna had an agc anticodon, it could attach to a(n) ________ mrna codon.

UGA

TCG

UCG

AUG.

Answer

Correct Answer: UCG

Note: This Question is unanswered, help us to find answer for this one

86. Evidence for the spiral nature of dna came from ______.

X-ray crystallography studies

Base rule studies

Studies of disease-causing bacteria

Answer

Correct Answer: X-ray crystallography studies

Note: This Question is unanswered, help us to find answer for this one

87. An individual who is homozygous ______.

Expresses the dominant trait.

Carries two different alleles for a gene.

Carries two copies of the same ...

Answer

Correct Answer: Expresses the dominant trait.

Note: This Question is unanswered, help us to find answer for this one

88. The second messenger _____ opens ca2+ channels in the endoplasmic reticulum.

Experiment2 (right figure)

Hormone response elements

Secondary active symport

Inositol trisphosphate

Answer

Correct Answer: Inositol trisphosphate

Note: This Question is unanswered, help us to find answer for this one

89. Defensive proteins are manufactured by the _____ system.

Immune

Tendons

Muscles

Spider silk

Answer

Correct Answer: Immune

Note: This Question is unanswered, help us to find answer for this one

90. Two genes are recognized as orthologous if __________.

They are homologous genes found in different species

Prokaryotes needed more division as they were more diverse

The validity of the three domains is supported by many studies, including a recent study that analyzed

It is not clear whether eukaryotes are more closely related to bacteria or archaea.

Answer

Correct Answer: They are homologous genes found in different species

Note: This Question is unanswered, help us to find answer for this one

91. __________ alter repressor proteins thereby increasing the rate of transcription initiation.

Inducers

Corepressors

Effectors

Modulators.

Answer

Correct Answer: Inducers

Note: This Question is unanswered, help us to find answer for this one

92. ____ is required for dna-dependent nucleosome assembly. (hint: it binds pncf.)

CAF11/Asf1

CAF5/Asf1

CAF1/Asf1

CAF1/Asf2

Answer

Correct Answer: CAF1/Asf1

Note: This Question is unanswered, help us to find answer for this one

93. Complex genetic diseases are different from single-gene diseases because they __________.

Cause death almost instantly

Are caused by mutations to multiple genes

Are more easily passed from one generation to the next

Cannot be affected by lifestyle choices

Answer

Correct Answer: Are caused by mutations to multiple genes

Note: This Question is unanswered, help us to find answer for this one

94. Genetic research and testing includes __________.

The Human Genome Project

Gene therapy.

Genetically engineering drugs.

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

95. Mutations that arise in nature, from no particular artificial agent, are called ________.

Natural mutations.

Induced mutations.

Spontaneous mutations

Non of these

Answer

Correct Answer: Natural mutations.

Note: This Question is unanswered, help us to find answer for this one

96. The refers to the underlying genetic structure that leads to the observable .

Phenotype; genogram

Genotype; phenotype

Phenotype; genotype

Genetic map; genetic architecture

Answer

Correct Answer: Genotype; phenotype

Note: This Question is unanswered, help us to find answer for this one

97. Abdominal pain, vomiting, and fever are most likely due to _______.

Infection

Diaphragm.

Spleen.

Guarding.

Answer

Correct Answer: Infection

Note: This Question is unanswered, help us to find answer for this one

98. Mutations in genes that encode __________ represent the mutator phenotype.

By-pass or tolerance system that allows DNA replication across damage areas at the cost of fidelity.

Repair system proteins, or fidelity of replication proteins

Dam methylation system marks the GATC sequence in the original strand and unmethylated daughter strand is repaired.

Act as a nuclease, which directly cleaves LexA repressor

Answer

Correct Answer: Repair system proteins, or fidelity of replication proteins

Note: This Question is unanswered, help us to find answer for this one

99. During replication, each parent dna strand serves as a _____ for synthesis of new dna strands.

Scaffold

Reservoir

Copy point

Template

Comparison molecule

Answer

Correct Answer: Template

Note: This Question is unanswered, help us to find answer for this one

100. When the blending of traits occurs, it is referred to as the principle of _____.

Heredity

Complete dominance

Incomplete dominance

Hybridization

Answer

Correct Answer: Incomplete dominance

Note: This Question is unanswered, help us to find answer for this one

101. When nonhomologous chromosomes exchange parts, a(n) _____ has occurred.

Inversion

Reciprocal translocation

Mismatch

Base exclusion

Answer

Correct Answer: Reciprocal translocation

Note: This Question is unanswered, help us to find answer for this one

102. When mrna is synthesized using the information from dna, the process is called ________.

Transportation:

Transcription:

Transliteration:

Transposition:

Translation:

Answer

Correct Answer: Transcription:

Note: This Question is unanswered, help us to find answer for this one

103. When crossing over occurs, _______________ genes usually stay together.

Sex-linked

Multi-allelic

Pleiotropic

Independently assorting

Linked

Answer

Correct Answer: Linked

Note: This Question is unanswered, help us to find answer for this one

104. When a trait is controlled by ____________ alleles, the gene exists in several allelic forms.

Single

More than 1

Multiple

Answer

Correct Answer: Multiple

Note: This Question is unanswered, help us to find answer for this one

105. Viruses have two main structures: a(n) _____ and genetic material.

Capsid

Vaccine

Organelle

Host cell

Answer

Correct Answer: Capsid

Note: This Question is unanswered, help us to find answer for this one

106. Variegation normally does not result from _____?

Insertions in the chromosome

Nucleotide repair

Chromosome deletions

Chromosome breakage and rearrangements

Answer

Correct Answer: Nucleotide repair

Note: This Question is unanswered, help us to find answer for this one

107. Ultraviolet (uv) radiation is damaging because it _____.

Prevents Translation

Causes Mutation in the DNA

Prevents DNA Transcription

Causes Proein Synthesis

Answer

Correct Answer: Causes Mutation in the DNA

Note: This Question is unanswered, help us to find answer for this one

108. Transcription is turned off by _________.

Repression

Supression

Expresion

None of the above

Answer

Correct Answer: Repression

Note: This Question is unanswered, help us to find answer for this one

109. Traits that are determined by a single gene are termed as ____________.

Common in plants

Common in humans

Common in animals

None of the above

Answer

Correct Answer: Common in humans

Note: This Question is unanswered, help us to find answer for this one

110. The result of the following cross indicates that genotypically the offspring _____.

Are all rr

Are all Rr

Exhibit a 1 RR:2 Rr: 1 rr ratio

Exhibit a 3 RR: 1 rr ratio

Are all RR

Answer

Correct Answer: Are all Rr

Note: This Question is unanswered, help us to find answer for this one

111. The ____ complex moves ahead of rna polymerase and removes h2a/h2b from nucleosomes.

FACT

FAT

Both a and b

None of the above

Answer

Correct Answer: FACT

Note: This Question is unanswered, help us to find answer for this one

112. Recessive genes are usually expressed in humans only when ________.

They are coding for skin color.

They are coding for genetic diseases.

The organism is in the embryonic stage.

Both alleles are exactly the same, or homozygous.

Answer

Correct Answer: Both alleles are exactly the same, or homozygous.

Note: This Question is unanswered, help us to find answer for this one

113. Point mutations in the dna sequence do not cause _____ mutations.

Silent

Missense

Frameshift

None of the above

Answer

Correct Answer: Frameshift

Note: This Question is unanswered, help us to find answer for this one

114. Pleiotropic genes ____.

act on secondary sexual characteristics

influence more than one aspect of phenotype

are additive

produce lethal effects when homozygous

Can only affect one trait or characteristic at a time

Answer

Correct Answer: influence more than one aspect of phenotype

Note: This Question is unanswered, help us to find answer for this one

115. Plasmids have been found in all of the following types of cells except __________.

Animal cells

Fungal cells

Protozoan cells

Prokaryotic cells

Answer

Correct Answer: Animal cells

Note: This Question is unanswered, help us to find answer for this one

116. Okazaki fragments are formed because dna replication __________.

Is discontinuous on the lagging strand

Is contiuous on the lagging strand

Neither continuous nor discontinuous on the lagging strand

None of the above

Answer

Correct Answer: Is discontinuous on the lagging strand

Note: This Question is unanswered, help us to find answer for this one

117. Of the different possible codons, specify amino acids and signal stop.

20; 17; 3

180; 20; 60

64; 61; 3

61; 60; 1

Answer

Correct Answer: 64; 61; 3

Note: This Question is unanswered, help us to find answer for this one

118. Normal human gametes carry _____ chromosomes.

23 pairs of

46 pairs of

Answer

Correct Answer: 23 pairs of

Note: This Question is unanswered, help us to find answer for this one

119. Nonrandom mating tends to _ the frequencies of genotypes.

Increase; homozygous

Decrease; homozygous

Neither decrease nor increase; homozygous

None of the above

Answer

Correct Answer: Increase; homozygous

Note: This Question is unanswered, help us to find answer for this one

120. Mitochondrial dna is passed from _ to _.

Mothers; sons and daughters

Sons and daughters; mothers

Mothers; father

Father; sons and daughters

Answer

Correct Answer: Mothers; sons and daughters

Note: This Question is unanswered, help us to find answer for this one

121. Mendel's unit factors in pairs are most accurately known to be _______.

Identical alleles on homologous chromosomes

Two alleles on nonhomologous chromosomes

Two maternal chromatids

Two alleles on paternal and maternal homologs

Answer

Correct Answer: Two alleles on paternal and maternal homologs

Note: This Question is unanswered, help us to find answer for this one

122. Mendel's principle of segregation implies that the two members of an allelic pair of genes _____.

Are distributed to separate gametes

May contaminate one another

Are associated dependently, depending on all other genes

Are segregated pair-wise

Answer

Correct Answer: Are distributed to separate gametes

Note: This Question is unanswered, help us to find answer for this one

123. Mendel formulated his principles of inheritance based on _____.

Observations on the outcomes of breeding experiments

Underlying processes were unknown at the time

Both a and b

None of the above

Answer

Correct Answer: Both a and b

Note: This Question is unanswered, help us to find answer for this one

124. Mendel continued some of his experiments into the f2 or f3 generation to _____.

Obtain a larger number of offspring on which to base statistics

Observe whether or not a recessive trait would reappear

Observe whether or not the dominant trait would reappear

Distinguish which alleles were segregating

Answer

Correct Answer: Observe whether or not a recessive trait would reappear

Note: This Question is unanswered, help us to find answer for this one

125. Males have one x and one y chromosome on _____.

25th pair of chromosomes

23rd pair of chromosomes

21st pair of chromosomes

46th pair of chromosomes

Answer

Correct Answer: 23rd pair of chromosomes

Note: This Question is unanswered, help us to find answer for this one

126. Interactions among the human abo blood group alleles involve _ and __.

Co-dominance; complete dominance

Codominance; incomplete dominance

Complete dominance; incomplete dominance

Epistasis; complementation

Continuous variation; environmental variation

Answer

Correct Answer: Co-dominance; complete dominance

Note: This Question is unanswered, help us to find answer for this one

127. Information within dna and rna is contained within the sequence of the ____________ .

Nitrogenous bases.

Transcription bases.

Both a and b

None of the above

Answer

Correct Answer: Nitrogenous bases.

Note: This Question is unanswered, help us to find answer for this one

128. Incomplete dominance is a condition in plants and people where __________.

Offspring have an appearance in between the phenotypes of the two parents

Most heritable diseases arise

A single gene impacts more than one characteristic

Multiple alleles are responsible for an inheritance pattern

Answer

Correct Answer: Offspring have an appearance in between the phenotypes of the two parents

Note: This Question is unanswered, help us to find answer for this one

129. In the lactose operon of e. coli, the product of the laci gene is a(n) _____ of transcription.

Negative regulator

Positive regulator

Neither positive nor negative regulator

None of the above

Answer

Correct Answer: Negative regulator

Note: This Question is unanswered, help us to find answer for this one

130. In negative control, a gene is switched off when _____.

A kinase adds a phosphate to DNA

Lactose is transported into the cell

A regulatory protein binds to DNA and shuts down transcription

A regulatory protein is removed from DNA and shuts down transcription

Answer

Correct Answer: A regulatory protein binds to DNA and shuts down transcription

Note: This Question is unanswered, help us to find answer for this one

131. In humans, the inheritance of ______ is best explained as being polygenic.

Blood type

Height

Sickle-cell disease

Cystic fibrosis

Answer

Correct Answer: Height

Note: This Question is unanswered, help us to find answer for this one

132. In humans, height and skin color have continuous variation in the population because of __________.

Incomplete dominance

Epistasis

Multiple alleles

Codominance

Polygenic inheritance

Answer

Correct Answer: Polygenic inheritance

Note: This Question is unanswered, help us to find answer for this one

133. In eukaryotic cells, a terminator in mrna synthesis is _____.

A specific nucleotide sequence in RNA that signals the DNA polymerase to stop

A specific nucleotide sequence in DNA that signals the RNA polymerase to stop

Both a and b

None of the above

Answer

Correct Answer: A specific nucleotide sequence in DNA that signals the RNA polymerase to stop

Note: This Question is unanswered, help us to find answer for this one

134. In dna, the two purines are , and the two pyrimidines are .

Adenine and guanine; cytosine and thymine

Cytosine and thymine; adenine and guanine

Both a and b

None of the above

Answer

Correct Answer: Adenine and guanine; cytosine and thymine

Note: This Question is unanswered, help us to find answer for this one

135. In a long dna molecule, each origin of replication produces a _ with a _ on each side.

Replication bubble; replication fork

Replication fork; replication bubble

Replication bubble; DNA ligase

Replication fork; DNA ligase

None of the other answer options is correct.

Answer

Correct Answer: Replication bubble; replication fork

Note: This Question is unanswered, help us to find answer for this one

136. In _____, one allele is dominant to a recessive allele.

Incomplete dominance

Simple dominance

Codominance

Pleiotrophy

Answer

Correct Answer: Simple dominance

Note: This Question is unanswered, help us to find answer for this one

137. Identical duplicates of the mother cell are created by _____.

Mitosis

Meiosis

Cytokinesis

Answer

Correct Answer: Mitosis

Note: This Question is unanswered, help us to find answer for this one

138. Heterochromatin is _, whereas euchromatin is _.

Composed of RNA, made of DNA

Composed of DNA, made of RNA

Composed of DNA, made of DNA and RNA

None of the above

Answer

Correct Answer: Composed of DNA, made of DNA and RNA

Note: This Question is unanswered, help us to find answer for this one

139. Heredity refers to the __________.

Passing of traits from parents to children

Passing of traits from children to other family members

Passing of traits from grandparents to children

None of the above

Answer

Correct Answer: Passing of traits from parents to children

Note: This Question is unanswered, help us to find answer for this one

140. Heredity allows for ______

Change between generations

Consistency between generations

Both A and B

Neither A nor B

Answer

Correct Answer: Both A and B

Note: This Question is unanswered, help us to find answer for this one

141. Hemophilia is caused by a sex-linked recessive allele. this means that __________.

A son who has hemophilia inherited the allele from his mother

A son who has hemophilia inherited the allele from his uncle

A son who has hemophilia inherited the allele from his aunt

A son who has hemophilia inherited the allele from his grandfather

Answer

Correct Answer: A son who has hemophilia inherited the allele from his mother

Note: This Question is unanswered, help us to find answer for this one

142. Hemophilia is ____.

A medicine

Disorder

Disease

Cure of a disease

Answer

Correct Answer: Disorder

Note: This Question is unanswered, help us to find answer for this one

143. Hemophilia appears rarely in females. this is because _____.

X-linked

Y-linked

Z-linked

None of the above

Answer

Correct Answer: X-linked

Note: This Question is unanswered, help us to find answer for this one

144. Hemophilia and ________ are two common sex-linked conditions.

Sour throat

Cancer

Color blindness

All of the above

Answer

Correct Answer: Color blindness

Note: This Question is unanswered, help us to find answer for this one

145. Genetic variation of individual chromosomes occurs during __________.

Metaphase I

Anaphase I

Prophase I

Prophase II

Answer

Correct Answer: Prophase I

Note: This Question is unanswered, help us to find answer for this one

146. Genetic therapy and engineering __________.

Have no value for our future

Have been used for many years to prevent genetic diseases

Are simple procedures that most doctors can perform

Are controversial scientific procedures

Answer

Correct Answer: Are controversial scientific procedures

Note: This Question is unanswered, help us to find answer for this one

147. Genes that carry contrasting inheritance factors are called _____.

Heterozygotes

Homozygotes

Alleles

Answer

Correct Answer: Heterozygotes

Note: This Question is unanswered, help us to find answer for this one

148. Genes that are _____________ do not assort independently, but they may recombine by crossing over.

Continuously variable

Pleiotropic

Polygenic

Epistatic

Linked

Answer

Correct Answer: Linked

Note: This Question is unanswered, help us to find answer for this one

149. Genes that are _ do not assort independently and are said to be _.

Close to each other on the same chromosome; linked

Close to each other on the same ribosomes; linked

Both a and b

None of the above

Answer

Correct Answer: Close to each other on the same chromosome; linked

Note: This Question is unanswered, help us to find answer for this one

150. For dna replication, a primer of ____ is needed at the origin of nucleotide addition.

Polymerase III

Polymerase I

Helicase

RNA

DNA

Answer

Correct Answer: RNA

Note: This Question is unanswered, help us to find answer for this one

151. For a species with four pairs of chromosomes, ________ gametic combinations are possible.

Answer

Correct Answer: 16

Note: This Question is unanswered, help us to find answer for this one

152. Eukaryotic cells have their dna enclosed in the _____.

Plasma membrane.

Nucleus.

Nucleoid.

Nucleolus.

Nucleotide.

Answer

Correct Answer: Nucleus.

Note: This Question is unanswered, help us to find answer for this one

153. Each of the following events occurs during mitosis except _______.

Polar microtubules contract, pulling attached chromosomes toward the poles

Chromosomes condense

Microtubules assemble between centrioles

Nuclear membrane breaks down

Answer

Correct Answer: Polar microtubules contract, pulling attached chromosomes toward the poles

Note: This Question is unanswered, help us to find answer for this one

154. During the process of translation, __________ matches an mrna codon with the proper amino acid.

Messenger RNA

DNA polymerase

A ribosome

Transfer RNA

Answer

Correct Answer: Transfer RNA

Note: This Question is unanswered, help us to find answer for this one

155. During replication, the original "parent" dna __________.

Serves as the template for the creation of two complete sets of DNA

Serves as the template for the creation of four complete sets of DNA

Serves as the template for the creation of six complete sets of DNA

Serves as the template for the creation of eight complete sets of DNA

Answer

Correct Answer: Serves as the template for the creation of two complete sets of DNA

Note: This Question is unanswered, help us to find answer for this one

156. During binary fission, a bacteria cell grows in size because dna and other organelles are _____.

Exchanged

Transferred

Duplicated

Removed

Answer

Correct Answer: Duplicated

Note: This Question is unanswered, help us to find answer for this one

157. Down syndrome is an example of , and the child is for chromosome 21.

Aneuploidy; trisomic

Trisomic; aneuploidy

Both a and b

None of the above

Answer

Correct Answer: Aneuploidy; trisomic

Note: This Question is unanswered, help us to find answer for this one

158. Dna polymerases use ______ as their substrate.

Four different nitrogenous bases

The 5' end of a preexisting DNA

Deoxyribonucleoside triphosphates (dNTPs)

Deoxyribonucleoside monophosphates (dNMPs)

Answer

Correct Answer: Deoxyribonucleoside triphosphates (dNTPs)

Note: This Question is unanswered, help us to find answer for this one

159. Chargaff found that in dna samples, __________.

The ratio of A to T is close to 1:1 and the ratio of G to C is close to 1:1

The ratio of A to G is close to 1:1 and the ratio of T to C is close to 1:1

The number of A + T = 50% of the total bases

The number of A + T = G + C

The ratio of A to C is close to 1:1 and the ratio of G to T is close to 1:1

Answer

Correct Answer: The ratio of A to T is close to 1:1 and the ratio of G to C is close to 1:1

Note: This Question is unanswered, help us to find answer for this one

160. Both a base and a phosphate are attached ____ in a nucleotide.

To each other

To a sugar

To each other and to a sugar

None of these answers is true because phosphate is not part of a nucleotide.

Answer

Correct Answer: To a sugar

Note: This Question is unanswered, help us to find answer for this one

161. All the information needed to make proteins is coded in dna by _____.

The shapes of molecules

The sizes of lipids

The order of bases

The number of carbohydrates

Answer

Correct Answer: The order of bases

Note: This Question is unanswered, help us to find answer for this one

162. All of the substances are ____________, which cause inheritable changes in genetic material.

Agents

Mutagens

Pathogens

Vectors

Answer

Correct Answer: Mutagens

Note: This Question is unanswered, help us to find answer for this one

163. After meiosis, each new cell nucleus contains _____ chromosomes.

Answer

Correct Answer: 23

Note: This Question is unanswered, help us to find answer for this one

164. A skin cell in g2 of interphase has _______________ as much dna as it had in g1.

Half

Twice

Exactly

One-fourth

Four times

Answer

Correct Answer: Twice

Note: This Question is unanswered, help us to find answer for this one

165. According to darwin, natural selection is based on the ____ found in populations.

Acquired characters

Variations

Weakest members

Noncompetitors

Similarities

Answer

Correct Answer: Variations

Note: This Question is unanswered, help us to find answer for this one

166. After dna replication is completed, _____.

One dna double helix consists of two old strands and one dna double helix consists of two new strands

Each new DNA double helix consists of one old DNA strand and one new DNA strand

Each of the four dna strands consists of some old strand parts and some new strand parts there are four double helices

Each new dna double helix consists of two new strands

Answer

Correct Answer: Each new DNA double helix consists of one old DNA strand and one new DNA strand

Note: This Question is unanswered, help us to find answer for this one

167. Erection (vasodilation) of the penis or clitoris ________.

Is the result of coordinated activation by both sympathetic and parasympathetic input

Is primarily under sympathetic control

Is primarily under parasympathetic control

Depends very little on autonomic activation

Answer

Correct Answer: Is primarily under parasympathetic control

Note: This Question is unanswered, help us to find answer for this one

168. Homologous pairs of chromosomes are lined up independently of other such pairs during _____.

Metaphase I

B,C,F, and G

Microevolution

Genetic drift

Answer

Correct Answer: Metaphase I

Note: This Question is unanswered, help us to find answer for this one

169. During the process of _______________, the genetic message from dna is transformed into mrna.

Mitosis

Transcrption

Replication

Transcript; ribosome

Answer

Correct Answer: Transcrption

Note: This Question is unanswered, help us to find answer for this one

170. Genes that code for the same genetic trait are __________.

Alleles

Recessive

Phenotype

Punnett square

Answer

Correct Answer: Alleles

Note: This Question is unanswered, help us to find answer for this one

171. During rna processing a(n) _____ is added to the 5' end of the rna.

3' untranslated region

A long string of adenine nucleotides

5' untranslated region

Coding segment

Modified guanine nucleotide

Answer

Correct Answer: Modified guanine nucleotide

Note: This Question is unanswered, help us to find answer for this one

172. Telomeres are __________.

The sequence of nucleotides along the length of the two strands of the DNA molecule

That the sugar-phosphate backbones are to the inside of the molecule

Repeating noncoding sequences at the ends of linear eukaryotic chromosomes

Replicates in a semiconservative fashion

Answer

Correct Answer: Repeating noncoding sequences at the ends of linear eukaryotic chromosomes

Note: This Question is unanswered, help us to find answer for this one

173. Examine the genetic code table, shown below. the codon agc codes for the amino acid ______.

Serine

Arginine

Threonine

Alanine

Answer

Correct Answer: Serine

Note: This Question is unanswered, help us to find answer for this one

174. Dna and rna are polymers composed of ______ monomers.

Amino Acid

Fatty Acid _monomers

Carbohydrate

Nucleotide

Answer

Correct Answer: Nucleotide

Note: This Question is unanswered, help us to find answer for this one

175. A woman has blond hair and brown eyes. this statement is best described as indicating ________.

Allelic pairs

Recessive traits

Phenotype

Genotype

Answer

Correct Answer: Phenotype

Note: This Question is unanswered, help us to find answer for this one

176. Genes ________ human action.

Noble savage

Enable

Dna

None of these

Answer

Correct Answer: Enable

Note: This Question is unanswered, help us to find answer for this one

177. The sugar and phosphate portion of the nucleotides are found _____ on the dna twisted ladder.

As the rungs

As segments of the rails

As conditions between the steps and the rails

None of the above

Answer

Correct Answer: As segments of the rails

Note: This Question is unanswered, help us to find answer for this one

178. The signal transduction pathway allows ________

A cell to repair damage to its DNA

Whole genomes to be sequenced

Genes from one organism to be inserted into the nucleus of another organism's cells

One cell to regulate the gene expression of another cell

Whole genomes to be assembled

Answer

Correct Answer: One cell to regulate the gene expression of another cell

Note: This Question is unanswered, help us to find answer for this one

179. The rna segments spliced to one another during rna processing are _____.

Caps

Exons

SnRNPs

Tails

Introns

Answer

Correct Answer: Exons

Note: This Question is unanswered, help us to find answer for this one

180. The most controversial technique of genetic engineering is _____.

Recombinant DNA

Hybridization

Inducing mutation

Cloning

Answer

Correct Answer: Cloning

Note: This Question is unanswered, help us to find answer for this one

181. The initial product of transcription is referred to as the _____ transcript.

Primary

Phosphodiester

Transcription

Promoter

Answer

Correct Answer: Primary

Note: This Question is unanswered, help us to find answer for this one

182. The cross-fertilization of two different, but true-breeding, varieties of pea plants will _____.

Result in hybrid plants

Alternative version of a gene

Contain different alleles

Answer

Correct Answer: Result in hybrid plants

Note: This Question is unanswered, help us to find answer for this one

183. Polypeptides are assembled from _____

Hexoses

Glycerol

Nucleotides

Proteins

Amino acids

Answer

Correct Answer: Amino acids

Note: This Question is unanswered, help us to find answer for this one

184. Nucleic acids are assembled in the _____ direction

5' to 1'

4' to 5'

5' to 3'

1' to 5'

2' to 3

Answer

Correct Answer: 5' to 3'

Note: This Question is unanswered, help us to find answer for this one

185. Messenger rna molecules contain information that is used to synthesize ___________.

Nucleotides

Amino acids

Polypeptides(proteins)

Fatty acids

Answer

Correct Answer: Polypeptides(proteins)

Note: This Question is unanswered, help us to find answer for this one

186. Males have one x and _______ y chromosome on .

One

Two

Three

None of these

Answer

Correct Answer: One

Note: This Question is unanswered, help us to find answer for this one

187. Linked genes may violate mendel's ____.

Principle of independent assortment

Separation of homologs

Blending inheritance

None of these

Answer

Correct Answer: Principle of independent assortment

Note: This Question is unanswered, help us to find answer for this one

188. Linked genes are inherited together. this is because linked genes _____.

Govern traits (such as hair texture and hair color) that are functionally related

Govern traits that have nothing to do with one another

Are on the same chromosome

Have the same alleles residing on them

Answer

Correct Answer: Are on the same chromosome

Note: This Question is unanswered, help us to find answer for this one

189. In rho-dependent transcription termination, the rho factor binds to ___________.

RNA

DNA (near the end of the transcribed region)

RNA polymerase core enzyme

Sigma subunit

Answer

Correct Answer: RNA

Note: This Question is unanswered, help us to find answer for this one

190. In evolutionary terms, an organism's fitness is measured by its _____.

Natural selection

Contribution to the gene pool of the next generation

Directional selection

Answer

Correct Answer: Contribution to the gene pool of the next generation

Note: This Question is unanswered, help us to find answer for this one

191. In considering the cross yyrr x yyrr, the phenotype ratios of the f2 generation will be _____.

9:3:3:1

9:2:2:1

9:4:4:1

9:5:5:1

Answer

Correct Answer: 9:3:3:1

Note: This Question is unanswered, help us to find answer for this one

192. The _____ directs a trna matching the mrna code to the proper sequence to assemble the protein.

Ribosome

Intestine

Essential

Nitrogen

Answer

Correct Answer: Ribosome

Note: This Question is unanswered, help us to find answer for this one

193. In humans, there are _______ autosomal linkage groups, plus an x and y chromosome linkage group.

Answer

Correct Answer: 22

Note: This Question is unanswered, help us to find answer for this one

194. In a eukaryotic cell transcription takes place _____

On the cell membrane

In the rough endoplasmic reticulum

In the cytoplasm

In the nucleus

Answer

Correct Answer: In the nucleus

Note: This Question is unanswered, help us to find answer for this one

195. Epithelial tissues are found ________.

Lining hollow organs

Transcription

Underlined

In all upper case letters

In italics

Answer

Correct Answer: Lining hollow organs

Note: This Question is unanswered, help us to find answer for this one

196. X-ray diffraction images produced by showed that dna is a .

Pauling; triple helix

Franklin; double helix

Wilkins; triple helix

Watson; double helix

Answer

Correct Answer: Franklin; double helix

Note: This Question is unanswered, help us to find answer for this one

197. Transcription involves the transfer of information from __________.

MRNA to an amino acid sequence

DNA to an amino acid sequence

DNA to RNA

The nucleus to the cytoplasm

RNA to DNA

Answer

Correct Answer: DNA to RNA

Note: This Question is unanswered, help us to find answer for this one

198. The template for rna polymerase is , and the new rna chain is to the template.

An independent RNA segment / parallel and identical

DNA / antiparallel and complementary

An independent RNA segment / antiparallel and complementary

DNA / parallel and identical

Answer

Correct Answer: DNA / antiparallel and complementary

Note: This Question is unanswered, help us to find answer for this one

199. The shared genetic code of all life on earth is evidence that ______.

All life shares a common ancestry

The genetic code arose relatively late in the history of life on Earth

Bacterial cells arose earlier than eukaryotic cells

DNA replication is error-free

Answer

Correct Answer: All life shares a common ancestry

Note: This Question is unanswered, help us to find answer for this one

200. The rho protein is involved in the _____ stage of transcription.

Termination

Protein

Ribosomal

Translation

Genetic

Answer

Correct Answer: Termination

Note: This Question is unanswered, help us to find answer for this one

201. The incorporation of an incorrect base into a dna molecule during replication __________.

Can be repaired by the mismatch repair system

Cannot be repaired by the mismatch repair system

Complementary to the corresponding mRNA codon

None of these

Answer

Correct Answer: Can be repaired by the mismatch repair system

Note: This Question is unanswered, help us to find answer for this one

202. The energy required for assembly of a polypeptide by a ribosome comes directly from __________.

Ribozymes

ATP

Transcription units

GTP

Aminoacyl-tRNA synthetase

Answer

Correct Answer: GTP

Note: This Question is unanswered, help us to find answer for this one

203. Ribosomes form peptide bonds using their _____ activity.

Enzyme

Nuclease

Protease

Ribozyme

Answer

Correct Answer: Ribozyme

Note: This Question is unanswered, help us to find answer for this one

204. Ribosomes can attach to prokaryotic messenger rna _____.

Before transcription is complete

Confer to a cell additional genetic traits that are needed only under certain circumstances

Transfer genes to other locations within the genome

Infect cells in order to replicate their DNA

Answer

Correct Answer: Before transcription is complete

Note: This Question is unanswered, help us to find answer for this one

205. Plasmids function in bacterial cells to __________.

Transfer certain genes to other parts of the cell temporarily

Confer to a cell additional genetic traits that are needed only under certain circumstances

Transfer genes to other locations within the genome

Infect cells in order to replicate their DNA

Answer

Correct Answer: Confer to a cell additional genetic traits that are needed only under certain circumstances

Note: This Question is unanswered, help us to find answer for this one

206. If individuals tend to mate within a subset of the population, there is ________.

No selection

No genetic drift

No gene flow

Random mating

Answer

Correct Answer: Random mating

Note: This Question is unanswered, help us to find answer for this one

207. Hiv binds to ___________ and infects and kills t cells bearing this protein.

CD4+ cells

No genetic drift

No gene flow

Random mating

Answer

Correct Answer: CD4+ cells

Note: This Question is unanswered, help us to find answer for this one

208. Gene regulation can involve a protein repressor that blocks _____ from initiating transcription.

DNA polymerase I

DNA polymerase III

RNA polymerase

MRNA

RRNA

Answer

Correct Answer: RNA polymerase

Note: This Question is unanswered, help us to find answer for this one

209. During mrna splicing ______

SnRNPs that make up the spliceosome recognize and remove introns

The finished mRNA contains an uninterrupted message.

Both A & B

Answer

Correct Answer: Both A & B

Note: This Question is unanswered, help us to find answer for this one

210. During _______, rna polymerase synthesizes a molecule of rna using dna as a template.

MRNA splicing

Translation

Transcription

Gene sequencing

Termination

Answer

Correct Answer: Transcription

Note: This Question is unanswered, help us to find answer for this one

211. Dna molecules are copied or replicated by a _______ mechanism.

Conservative

Semiconservative

Dispersive

212. Dna affects the traits of an organism by providing the instructions for synthesizing _______.

Proteins

Nucleotides

Codons

Amino acids

Answer

Correct Answer: Proteins

Note: This Question is unanswered, help us to find answer for this one

213. ""differential reproduction"" is just another way of saying __________.

Variation

Mutation

Genetic drift

Natural selection

Answer

Correct Answer: Natural selection

Note: This Question is unanswered, help us to find answer for this one

214. _______ genes are expressed all of the time.

Activator

Constitutive

Clustered

Inducible

Repressed

Answer

Correct Answer: Constitutive

Note: This Question is unanswered, help us to find answer for this one

215. Which one of the following is true? a codon _____.

Is the basic unit of the genetic code

Can code for up to four different amino acids

Extends from one end of a tRNA molecule

Consists of four nucleotides

Answer

Correct Answer: Is the basic unit of the genetic code

Note: This Question is unanswered, help us to find answer for this one

216. Reverse transcription, carried out by retroviruses, is the process by which _____.

RNA information is copied into DNA

Can code for up to four different amino acids

Extends from one end of a tRNA molecule

Consists of four nucleotides

Answer

Correct Answer: RNA information is copied into DNA

Note: This Question is unanswered, help us to find answer for this one

217. Reverse transcriptase produces __________ from an rna template.

RNA

CDNA

RRNA

DNA

Answer

Correct Answer: CDNA

Note: This Question is unanswered, help us to find answer for this one

218. Most of the genes controlling development encode either signal molecules or ________.

Morphogens

Homeotic genes

Transcription factors

Embryonic patterns

Answer

Correct Answer: Transcription factors

Note: This Question is unanswered, help us to find answer for this one

219. In eukaryotes, homologous recombination is initiated by ________.

ATM signaling double-stranded DNA breaks

P53 generating single-stranded DNA breaks

Spo11 generating double-stranded DNA breaks

RecA, RecB, and RecC generating single-stranded DNA breaks

Rad51 generating double-stranded DNA breaks

Answer

Correct Answer: Spo11 generating double-stranded DNA breaks

Note: This Question is unanswered, help us to find answer for this one

220. In eukaryotes, the process of transcription is controlled by _____.

DNA

CDNA

RRNA

RNA

Answer

Correct Answer: DNA

Note: This Question is unanswered, help us to find answer for this one

221. Dna is synthesized through a process known as _____.

Semiconservative replication

Conservative replication

Translation

Transcription

Answer

Correct Answer: Semiconservative replication

Note: This Question is unanswered, help us to find answer for this one

222. All of the following are involved in the process of trna charging except __________.

RRNA

TRNA

Amino acid

Answer

Correct Answer: RRNA

Note: This Question is unanswered, help us to find answer for this one

223. A recessive trait will be observed in individuals that are ________ for that trait.

Heterozygous

Homozygous or heterozygous

Homozygous

Diploid

Answer

Correct Answer: Homozygous

Note: This Question is unanswered, help us to find answer for this one

224. A nucleotide contains each of the following except a(n) _____.

Protein

Sugar molecule

Nitrogenous base

Phosphate group

Answer

Correct Answer: Protein

Note: This Question is unanswered, help us to find answer for this one

225. A (an) _______ is a group of three bases on trna that is complementary to a specific mrna codon.

Anticodon

Codon

Amino acids

Answer

Correct Answer: Anticodon

Note: This Question is unanswered, help us to find answer for this one

226. ______ genes are expressed at a constant rate most of the time.

Activator

Inducible

Repressed

Constitutive

Answer

Correct Answer: Constitutive

Note: This Question is unanswered, help us to find answer for this one

227. One gene controls the synthesis of one _____

Peptide

Polypeptide

DNA molecule

Answer

Correct Answer: Polypeptide

Note: This Question is unanswered, help us to find answer for this one

228. The result of a defective enzyme caused by a mutation in the dna nucleotide sequence is ________.

A genetic disease.

AIDS.

HIV.

Recombinant DNA.

Translocation

Answer

Correct Answer: A genetic disease.

Note: This Question is unanswered, help us to find answer for this one

229. To isolate a cloned gene from a dna library, researchers ______.

Isolate dna from bacterial colonies and use reverse transcriptase to create cdna from the desi gene

Sequence dna from clones in the library to identify one with the desi gene

Probe the library using a labeled antibody specific for the gene

Probe the library using a labeled single-stranded dna complementary to the gene

Answer

Correct Answer: Probe the library using a labeled single-stranded dna complementary to the gene

Note: This Question is unanswered, help us to find answer for this one

230. The rate of elongation of a dna strand in prokaryotes is __________ the rate in eukaryotes.

Much slower than

The rates are not comparable because elongation only occurs in prokaryotes

Much faster than

About the same speed as

Sometimes faster and sometimes slower than

Answer

Correct Answer: Much faster than

Note: This Question is unanswered, help us to find answer for this one

231. The process of using the information in mrna to synthesize a protein is ______.

Protein synthesis

Much faster than

About the same speed as

Sometimes faster and sometimes slower than

Answer

Correct Answer: Protein synthesis

Note: This Question is unanswered, help us to find answer for this one

232. The operon model of the regulation of gene expression in bacteria was proposed by _____.

Watson and Crick

Franklin

Darwin

Jacob and Monod

Mendel

Answer

Correct Answer: Jacob and Monod

Note: This Question is unanswered, help us to find answer for this one

233. The founder effect differs from a population bottleneck in that the founder effect ________.

Is a type of natural selection

Can occur only on an oceanic island colony

Involves the isolation of a small colony of individuals from a larger population

Requires a small population

Answer

Correct Answer: Involves the isolation of a small colony of individuals from a larger population

Note: This Question is unanswered, help us to find answer for this one

234. The following may be caused by mobile genetic elements except ________________

Activate a gene in which they reside

Cause chromosome breaks

Disrupt a gene

Undergo mutation

All of the above

Answer

Correct Answer: Undergo mutation

Note: This Question is unanswered, help us to find answer for this one

235. The evolutionary force that operates on the basis of variation is __________.

Genetic drift

Mutation

Gene pool

Answer

Correct Answer: Genetic drift

Note: This Question is unanswered, help us to find answer for this one

236. The absence of a terminator in transcription will result in ______.

The creation of a virus

A strand of mRNA that lacks its cap and tail

The production of a longer RNA molecule

The production of a shorter RNA molecule

Answer

Correct Answer: The production of a longer RNA molecule

Note: This Question is unanswered, help us to find answer for this one

237. The abo blood group in humans is an example of __________ producing four phenotypes.

Polygenic inheritance

Multiple alleles

People with genetic disorders

Pleiotropy

Answer

Correct Answer: Multiple alleles

Note: This Question is unanswered, help us to find answer for this one

238. Kyle is genetically a male; this means he received a(n) ________.

Y chromosome from his mother, and an x chromosome from his father

X chromosome from his mother, and a y chromosome from his father

Answer

Correct Answer: X chromosome from his mother, and a y chromosome from his father

Note: This Question is unanswered, help us to find answer for this one

239. Each _____ is a specific segment of the dna with the code for production of one functional product.

Intron

Exon

Gene

Operator

Triplet

Answer

Correct Answer: Gene

Note: This Question is unanswered, help us to find answer for this one

240. Biologists generally rely on _____ to identify prokaryotic organisms.

DNA

RNA

None

Answer

Correct Answer: DNA

Note: This Question is unanswered, help us to find answer for this one

241. Molecular systematics might examine all of the following types of data except ________.

Proteins

DNA sequences

Amino acid sequences

Anatomical features

Answer

Correct Answer: Anatomical features

Note: This Question is unanswered, help us to find answer for this one

242. Extinction is ________.

Natural process

Always caused by human disturbance

The loss of communities from the planet

Proceeding more slowly now than at any other time

Something that occurs only rarely

Answer

Correct Answer: Natural process

Note: This Question is unanswered, help us to find answer for this one

243. The lac operon of e. coli is ________ when the repressor is bound to lactose.

Cloned

Unregulated

Active

Inactive

Answer

Correct Answer: Active

Note: This Question is unanswered, help us to find answer for this one

244. The lac operon constitutes all of these but _____

Operator

Promoter

Repressor

Structural gene

Answer

Correct Answer: Promoter

Note: This Question is unanswered, help us to find answer for this one

245. A(n) is to bacteria as a is to animal cells.

Retrovirus... virus

Phage... prophage

Prophage... provirus

RNA virus

Answer

Correct Answer: Prophage... provirus

Note: This Question is unanswered, help us to find answer for this one

246. A dna replication bubble forms at a specific sequence of bases called the ___________.

Origin of replication. Both leading and lagging strand. Bacterial chromosomes form a single replication bubble, but eukaroytes can form several along each chromosome

His finding would indicate that the virus injected both DNA and protein into the cell, revealing nothing about which of these molecules was the genetic material.

Eukaryotes contain linear chromosomes and therefore require telomerase to prevent loss of the ends of the chromosomes

(positively correlated) cells with initially longer telomeres had more divisions before cell division ceased

Answer

Correct Answer: Origin of replication. Both leading and lagging strand. Bacterial chromosomes form a single replication bubble, but eukaroytes can form several along each chromosome

Note: This Question is unanswered, help us to find answer for this one

247. A ________ allele will always be expressed regardless of what the other allele happens to be.

Dominant

Recessive

Sex

Autosomal

Answer

Correct Answer: Dominant

Note: This Question is unanswered, help us to find answer for this one

248. _____ is the first enzyme to synthesize a nucleic acid at a replication fork.

Topoisomerase II

Helicase

DNA polymerase

RNA primase

Answer

Correct Answer: DNA polymerase

Note: This Question is unanswered, help us to find answer for this one

249. Consider the following figure. it indicates that a single amino acid substitution ______.

May alter a protein so that it no longer functions properly

A repeating sugar-phosphate-sugar-phosphate pattern

Manufacture of a strand of RNA complementary to a strand of DNA

Each new DNA double helix consists of one old strand and one new strand

Answer

Correct Answer: May alter a protein so that it no longer functions properly

Note: This Question is unanswered, help us to find answer for this one

250. As a result of splicing, most protein-coding genes can encode ______ protein.

More than one. This allows one gene to code for different mRNAs.

Regions in primary transcript but not in final RNA

Poly (A) tail. saves from enzymes and starts translation like 3' tail.

Synthesis starts ate amino/N end and proceeds to carboxyl/C terminus

Answer

Correct Answer: More than one. This allows one gene to code for different mRNAs.

Note: This Question is unanswered, help us to find answer for this one

251. An anticodon is _____.

A set of triplet bases that is complementary to a codon triplet on mRNA

RNA polymerase links nucleotides to form mRNA.

Not considered to be alive, studied alongside other microbes such as bacteria

The outer covering of a virus constructed of individual protein subunits, surrounds a core of nucleic acid

Answer

Correct Answer: A set of triplet bases that is complementary to a codon triplet on mRNA

Note: This Question is unanswered, help us to find answer for this one

252. An allele that can be masked or suppressed by another allele is said to be __________.

Homozygous

Segregation

Recessive

Metaphase I

Answer

Correct Answer: Recessive

Note: This Question is unanswered, help us to find answer for this one

253. A mutation that has no effect on fitness is a ______.

The first and second bases

One addition and one deletion mutation.

Neutral mutation

A knock-out mutation results in a total absence of the mutated protein

Answer

Correct Answer: Neutral mutation

Note: This Question is unanswered, help us to find answer for this one

254. Is a complex molecule in the cell's chromosomes that carries genetic information.

Deoxyribonucleic acid (DNA)

Dominant-recessive genes principle

Genotype

Phenotype

Answer

Correct Answer: Deoxyribonucleic acid (DNA)

Note: This Question is unanswered, help us to find answer for this one

255. When describing down syndrome it's important to note that __________

It can be classified as a single-gene disorder

It is caused when red blood cells cannot properly form hemoglobin

It causes infected males to have low testosterone levels

It is usually caused by three copies of chromosome 21

Answer

Correct Answer: It is usually caused by three copies of chromosome 21

Note: This Question is unanswered, help us to find answer for this one

256. Short segments of newly synthesized dna are joined into a continuous strand by _____

DNA polymerase

Template

Helicase

Ligase

Answer

Correct Answer: Ligase

Note: This Question is unanswered, help us to find answer for this one

257. Rna processing involves the addition of ________ to the ends of the rna transcript.

Transcription

The promoter

Extra nucleotides

Translation

Answer

Correct Answer: Extra nucleotides

Note: This Question is unanswered, help us to find answer for this one

258. After replication, ______.

Each new DNA double helix consists of two old strands

Each new DNA double helix consists of one old strand and one new strand

Each new DNA double helix contains 25% of the old DNA double helix

Each new DNA double helix consists of two new strands

One new DNA double helix consists of two old strands and the other new DNA double helix consists of two new strands

Answer

Correct Answer: Each new DNA double helix consists of one old strand and one new strand

Note: This Question is unanswered, help us to find answer for this one

259. Nucleotides have a phosphate group attached at the ___ carbon atom of the sugar.

Answer

Correct Answer: 5'

Note: This Question is unanswered, help us to find answer for this one

260. Typically, when one wishes to represent a gene, the symbol used is _________.

Underlined

In all upper case letters

In italics

In bold print

In all lowercase letters

Answer

Correct Answer: In italics

Note: This Question is unanswered, help us to find answer for this one

261. This is an image of a _____

Phage

Bacterium

Protist

Moneran

Red blood cell

Answer

Correct Answer: Phage

Note: This Question is unanswered, help us to find answer for this one

262. The lac repressor protein binds to the operator when it is ______.

Not bound to lactose

Transcpitional control

Jacob and monod

Not transcribed

Answer

Correct Answer: Not bound to lactose

Note: This Question is unanswered, help us to find answer for this one

263. For natural selection to gene,rate evolutionary change in a population ____. .

Are traits,

Inherited,

Selection pressure. .

All

Answer

Correct Answer: All

Note: This Question is unanswered, help us to find answer for this one

264. When two haploid gametes combine, a zygote with _____ chromosomes forms.

Answer

Correct Answer: 24

Note: This Question is unanswered, help us to find answer for this one

265. Traits with continuous variation will often display a ________ shaped distribution when graphed.

Bell curve-

Round curve-

None

Answer

Correct Answer: Bell curve-

Note: This Question is unanswered, help us to find answer for this one

266. The function of the neuron's axon is to ________.

Carry messages to other cells

Insulate against leakage of electrical impulses

Receive messages from neighboring neurons

Regulate the neuron's life processes

Answer

Correct Answer: Carry messages to other cells

Note: This Question is unanswered, help us to find answer for this one

267. The receive information; the transmit information..

The dendrites, spores ..

Sponges,axons..

Axon.sponges .

The dendrites, axons

Answer

Correct Answer: The dendrites, axons

Note: This Question is unanswered, help us to find answer for this one

268. Migration reduces genetic differences between populations by allowing gene _____ between the two.

Sequence

Flow..

Trait

Answer

Correct Answer: Flow..

Note: This Question is unanswered, help us to find answer for this one

269. If genes are completely linked, all the offspring will be _________.

Recessive.

Recombinants.

Parental.

Dominant

Answer

Correct Answer: Parental.

Note: This Question is unanswered, help us to find answer for this one

270. Height, hair color, eye color, and intelligence are traits passed on by _____. .

Genes .

Chromosomes .

RNA

Answer

Correct Answer: Genes .

Note: This Question is unanswered, help us to find answer for this one

271. For a recessive gene to be expressed in the phenotype, it must be paired with a ____..

Allele .

Gene.. .

DNA

Answer

Correct Answer: Allele .

Note: This Question is unanswered, help us to find answer for this one

272. An allosteric molecule is one in which ________.

The term used to describe any case in which a protein's function at two site is affected by the binding of a regulatory molecule to a separate site.

The term used to describe any case in which a glucose's function at one site is affected by the binding of a regulatory molecule to a separate site.

The term used to describe any case in which a protein's function at one site is affected by the binding of a regulatory molecule to a separate site

Answer

Correct Answer: The term used to describe any case in which a protein's function at one site is affected by the binding of a regulatory molecule to a separate site

Note: This Question is unanswered, help us to find answer for this one

273. An allele that can mask another allele is said to be __________.

Homozygous

Dominant

Recessive

Heterozygous

Answer

Correct Answer: Dominant

Note: This Question is unanswered, help us to find answer for this one

274. A trait within an organism that is present but not expressed is called __________.

Recessive trait.

Genotype

Phenotype

Answer

Correct Answer: Recessive trait.

Note: This Question is unanswered, help us to find answer for this one

275. A trait controlled by a dominant gene ________.

Will be expressed even when the corresponding gene in the other half of the pair is different

Will be expressed only if it is paired with two recessive genes

Will not be expressed if it is paired with another dominant gene

Will not be expressed when the corresponding gene in the other half of the pair is different

Answer

Correct Answer: Will be expressed even when the corresponding gene in the other half of the pair is different

Note: This Question is unanswered, help us to find answer for this one

276. A terminator in mrna synthesis is a(n) __________.

Specific nucleotide sequence in DNA that signals a stop

Specific nucleotide sequence in RNA that signals a stop

A messenger RNA molecule

Answer

Correct Answer: Specific nucleotide sequence in DNA that signals a stop

Note: This Question is unanswered, help us to find answer for this one

277. A spontaneous generation process is a process that has ____.

No input

At least one output and one input, but the output obviously is insufficient to generate the input shown

No output

At least one input and one output, but the input obviously is insufficient to generate the output shown

Answer

Correct Answer: No input

Note: This Question is unanswered, help us to find answer for this one

278. A single genetic locus that controls more than one trait is said to be __________.

Autotrophic.

Polygenic.

Pleiotropic.

Linked.

Answer

Correct Answer: Pleiotropic.

Note: This Question is unanswered, help us to find answer for this one

279. A mechanism of inheritance that does not depend on differences in dna sequence is ______.

Histone H1-medicated inheritance

Nucleosomal inheritance

Chromatin remodeling inheritance

Epigenetic inheritance

Answer

Correct Answer: Epigenetic inheritance

Note: This Question is unanswered, help us to find answer for this one

280. A gene that affects the expression of a second gene is an example of __________________.

. pleiotropy

Codominance

Epistasis.

Polygenic inheritance.

Incomplete

Answer

Correct Answer: Epistasis.

Note: This Question is unanswered, help us to find answer for this one

281. The enzyme complex associated with dna in the associated figure is ________.

Helicase

DNA polymerase

RNA polymerase

Topoisomerase

Answer

Correct Answer: RNA polymerase

Note: This Question is unanswered, help us to find answer for this one

282. When we say that an organism is haploid, we mean that __________.

Fertilization

Crossing over

Ndependent assortment

Answer

Correct Answer: Fertilization

Note: This Question is unanswered, help us to find answer for this one

283. Translation begins when a __ molecule binds to a .

MRNA; complete ribosome

MRNA; small ribosomal subunit

TRNA; small ribosomal subunit

TRNA; large ribosomal subunit

Answer

Correct Answer: MRNA; small ribosomal subunit

Note: This Question is unanswered, help us to find answer for this one

284. Transcytosis is the mechanism whereby ________ is/are absorbed.

Peptides

Bicarbonate

Enzymes

Answer

Correct Answer: Peptides

Note: This Question is unanswered, help us to find answer for this one

285. The unique sequence of bases in a nucleic acid is called the ________ structure.

Primary

Secondary

Basic

Answer

Correct Answer: Primary

Note: This Question is unanswered, help us to find answer for this one

286. The transcription enzyme first attaches to the ________ of the gene.

Promoter

Terminator

Promoter region

Answer

Correct Answer: Promoter

Note: This Question is unanswered, help us to find answer for this one

287. The transcribed and translated region of a gene is the __________ region.

Leader

Promoter

Coding

Trailer

Answer

Correct Answer: Coding

Note: This Question is unanswered, help us to find answer for this one

288. The three principal structural components of a nucleotide are ________.

A phosphate group, a deoxyribose sugar, and a nitrogenous base

A phosphate group, a oxyribose sugar, and double helix

A phosphate group, a deoxyribose sugar, and a double helix

Answer

Correct Answer: A phosphate group, a deoxyribose sugar, and a nitrogenous base

Note: This Question is unanswered, help us to find answer for this one

289. The sequence of nucleotides in a dna molecule is called the ________ code.

Nucleotides.

Cell

Nucleus

Answer

Correct Answer: Nucleotides.

Note: This Question is unanswered, help us to find answer for this one

290. The sequence of ________________ in a dna molecule determines the protein that will be produced

Lipids

Nucleotides

Proteins Eliminate

Sugars

Answer

Correct Answer: Nucleotides

Note: This Question is unanswered, help us to find answer for this one

291. The separated strands of dna are completed into two double helixes by dna _________.

Helicase

Helix

Polymerase

Answer

Correct Answer: Polymerase

Note: This Question is unanswered, help us to find answer for this one

292. The constricted region of a chromosome is called a , and it is used to hold _.

Centromere; chromatids to each other and to the mitotic spindle

Centrosome; chromatids to eachother

Chromatid; centromeres to each other

Centriole; chromatids to the mitotic spindle

Answer

Correct Answer: Centromere; chromatids to each other and to the mitotic spindle

Note: This Question is unanswered, help us to find answer for this one

293. Relative dating uses ______ to estimate how old a fossil is.

Depth within rock layers

Homologous structures

Convergent evolution

None of these

Answer

Correct Answer: Depth within rock layers

Note: This Question is unanswered, help us to find answer for this one

294. Spliceosomes are composed of _____.

Polymerases and ligases

SnRNPs and other proteins

Introns and exons

SnRNP and snumps

Answer

Correct Answer: SnRNPs and other proteins

Note: This Question is unanswered, help us to find answer for this one

295. The dna codon agt codes for an amino acid carried by a trna with the anticodon ______.

TCA

AGU

TCU

AGT

Answer

Correct Answer: AGU

Note: This Question is unanswered, help us to find answer for this one

296. The term "true-breeding plants" means __________.

That pea plants will produce plants that have a different trait of a particular character

That Mendel obtained all of his information from true-breeding plants because they have the strongest character

That pea plants choose with whom they mate

That pea plants will breed only with other pea plants

That self-pollinating plants will always produce the same trait of a particular character

Answer

Correct Answer: That self-pollinating plants will always produce the same trait of a particular character

Note: This Question is unanswered, help us to find answer for this one

297. The process of ________ requires the activity of dna ligase.

Translation

Capping

Transcription

DNA replication

Answer

Correct Answer: DNA replication

Note: This Question is unanswered, help us to find answer for this one

298. This is an image of a(n) _____

Nucleotide

Thymine

Cytosine

Nucleoside

Answer

Correct Answer: Nucleotide

Note: This Question is unanswered, help us to find answer for this one

299. The sickle-cell β-globin mutation is an example of a __________.

Missense mutation

Pointless mutation

Silent mutation

Nonsense mutation

Answer

Correct Answer: Missense mutation

Note: This Question is unanswered, help us to find answer for this one

300. The anticodon of uag is ________.

ATC

UAG

AAC

AUC

Answer

Correct Answer: AUC

Note: This Question is unanswered, help us to find answer for this one

301. Stop codons are also called ________ codons.

Nonsense

Release factor

Degeneracy

Conversion

Answer

Correct Answer: Nonsense

Note: This Question is unanswered, help us to find answer for this one

302. A nitrogenous base is indicated by the letter _____.

Answer

Correct Answer: C

Note: This Question is unanswered, help us to find answer for this one

303. The product of the laci gene is _____.

The repressor

An enzyme

An inducer

β-galactosidase

Answer

Correct Answer: The repressor

Note: This Question is unanswered, help us to find answer for this one

304. The nucleotides in the backbone of dna are held together by ________ bonds.

Phosphodiester.

Peptide.

Hydrogen.

Glycosidic

Answer

Correct Answer: Hydrogen.

Note: This Question is unanswered, help us to find answer for this one

305. The letter a indicates a _____.

Supercoils.

A nucleosome.

DNA double helix.

Histones

Answer

Correct Answer: DNA double helix.

Note: This Question is unanswered, help us to find answer for this one

306. The function of mitosis and cytokinesis is to produce daughter cells that __________.

Are genetically identical to the parent cell

Are genetically different to the parent cell

Both A & B

None of the above

Answer

Correct Answer: Are genetically identical to the parent cell

Note: This Question is unanswered, help us to find answer for this one

307. The anticodon of a particular trna molecule is _____.

Select from list below

Aminoacyl-tRNA synthetase

Several transcription factors have bound to the promoter

Simultaneous translation and transcription

Complementary to the corresponding mRNA codon

Answer

Correct Answer: Complementary to the corresponding mRNA codon

Note: This Question is unanswered, help us to find answer for this one

308. Transcription is the ______.

Manufacture of a strand of RNA complementary to a strand of DNA

Manufacture of a protein based on information carried by RNA

Modification of a strand of RNA prior to the manufacture of a protein

Manufacture of two new DNA double helices that are identical to an old DNA double helix

Answer

Correct Answer: Manufacture of a strand of RNA complementary to a strand of DNA

Note: This Question is unanswered, help us to find answer for this one

309. The most common time individual assortment occurs is when genes are ________?

Linked

Close Together

Unlinked

On non-sister chromatids of homologues

Answer

Correct Answer: Unlinked

Note: This Question is unanswered, help us to find answer for this one

310. In the process of transcription, _____.

Proteins are synthesized

DNA is replicated

RNA is synthesized

MRNA attaches to ribosomes

Answer

Correct Answer: RNA is synthesized

Note: This Question is unanswered, help us to find answer for this one

311. In humans, skin color is controlled by several genes. thus, skin color is a(n) ____ characteristic.

Epistatic

Stabilizing

Evolution

Directional

Answer

Correct Answer: Epistatic

Note: This Question is unanswered, help us to find answer for this one

312. Dna replication always proceeds by adding new bases to the _______ end of an existing strand.

Answer

Correct Answer: 3'

Note: This Question is unanswered, help us to find answer for this one

313. Your chromosomes are located _ and they are made of _____ .

Outside the nucleus; DNA

Inside the nucleus; DNA

DNA; inside the nucleus

None of these

Answer

Correct Answer: Inside the nucleus; DNA

Note: This Question is unanswered, help us to find answer for this one

314. Up to ____% of weight is determined by genetics.

24 percent

25 percent

27 percent

28percent

Answer

Correct Answer: 25 percent

Note: This Question is unanswered, help us to find answer for this one

315. Which of the following statements about the voyage of the beagle ______ is true?

It turned into a tremendous opportunity for Darwin to collect fossils, plants, and animals

Its purpose was to identify the fastest route from the Atlantic to the Pacific Ocean

It ended with the sinking of the ship off of the coast of Australia, almost four years into its journey

It lasted almost 2 years

Answer

Correct Answer: It turned into a tremendous opportunity for Darwin to collect fossils, plants, and animals

Note: This Question is unanswered, help us to find answer for this one

316. Typical eukaryotic genomes are composed of ________ dna molecule(s).

Multiple linear

Multiple circular

A single circular

A single linear

Answer

Correct Answer: Multiple linear

Note: This Question is unanswered, help us to find answer for this one

317. The way that proteins fold into beta pleated sheets and alpha helices is dependent on their _____.

Every gene encodes a separate enzyme

Primary Structure

A charged tRNA binds to the A site.

TRNA charging, in which the tRNAs bind to amino acids

Size, charge, and R group; nucleotide sequence

Answer

Correct Answer: Primary Structure

Note: This Question is unanswered, help us to find answer for this one

318. The trp (tryptophan) operon is an example of a(n) __________ operon.

Inducible

The p53 gene

Allolactose, the isomer of lactose

Repressible

Answer

Correct Answer: Repressible

Note: This Question is unanswered, help us to find answer for this one

319. The trna anticodon, gac, is complementary to the mrna codon with the sequence _____.

GA C

TCG

CTG

CU G

CA G

Answer

Correct Answer: CU G

Note: This Question is unanswered, help us to find answer for this one

320. X-linked recessive traits in humans (or in drosophila) are observed ________.

In more males than females

In more females than males

In males and females equally

In different distributions depending on the trait

Answer

Correct Answer: In more males than females

Note: This Question is unanswered, help us to find answer for this one

321. When you cross two heterozygotes (aa), the offspring will most likely be __________.

An eye cell from a female grasshopper

The hybrid offspring of a cross are the P1 generation.

In the ratio 1:1 homozygotes to heterozygotes

Genes for two different traits would be inherited together as a pair

Answer

Correct Answer: In the ratio 1:1 homozygotes to heterozygotes

Note: This Question is unanswered, help us to find answer for this one

322. Viroids are _ molecules and are found in _.

MRNA moves from the nucleus to the cytoplasm following RNA processing

Small circular RNA ... potatoes and other vegetables

Each parental strand serves as a template for the synthesis of a complementary strand

A set of triplet bases that is complementary to a codon triplet on mRNA

Answer

Correct Answer: Small circular RNA ... potatoes and other vegetables

Note: This Question is unanswered, help us to find answer for this one

323. Trna molecules work to _____.

Transcribe DNA to mRNA

Translate DNA to produce a specific amino acid sequence

Transcribe the amino acid sequence to DNA

Translate mRNA to produce a specific amino acid sequence

Answer

Correct Answer: Translate mRNA to produce a specific amino acid sequence

Note: This Question is unanswered, help us to find answer for this one

324. To use rflp analysis to detect a snp, the snp must _______.

Cause disease

Occur in homozygous form

Occur within a restriction enzyme recognition sequence

Be present in at least 1% of the population

Answer

Correct Answer: Occur within a restriction enzyme recognition sequence

Note: This Question is unanswered, help us to find answer for this one

325. The type of mutation represented below is a(n) _____.

Ribosomes in the cell cytoplasm.

A G paired with a T

Adenine, guanine, cytosine, thymine

MRNA attaches to the small subunit of a ribosome.

Insertion

Answer

Correct Answer: Insertion

Note: This Question is unanswered, help us to find answer for this one

326. The toba supervolcanic event caused a bottleneck in the human population by _______.

Raising global temperatures

Humans choking on volcanic ash

Inducing an ice age

Volcanic lava burning human villages

Answer

Correct Answer: Inducing an ice age

Note: This Question is unanswered, help us to find answer for this one

327. Transcription and translation take place in the and , respectively.

Nucleus; cytoplasm

Nucleolus; nucleus

Nucleolus; cytoplasm

Cytoplasm; nucleus

Answer

Correct Answer: Nucleus; cytoplasm

Note: This Question is unanswered, help us to find answer for this one

328. The genetic information is coded in dna by the ________.

The sequence of the nucleotides

The regular alteration of sugar and phosphate molecules.

The arrangement of the histones

The three-dimensional structure of the double hellix

Answer

Correct Answer: The sequence of the nucleotides

Note: This Question is unanswered, help us to find answer for this one

329. The genetic code is the link between the and the that they represent.

Somatic cells; diploid (2n)

MRNA codons; 20 amino acids

Nucleotides; nitrogenous base

Each daughter DNA consists of one new helix and one old helix

Answer

Correct Answer: MRNA codons; 20 amino acids

Note: This Question is unanswered, help us to find answer for this one

330. The actual photographed resolution is known as the ______ resolution.

Native

Original

Optical

Raw

Answer

Correct Answer: Optical

Note: This Question is unanswered, help us to find answer for this one

331. The size of dna is often given in the number of _____ that it contains.

Genes

Codons

Base pairs

Proteins

Triplets

Answer

Correct Answer: Base pairs

Note: This Question is unanswered, help us to find answer for this one

332. Part a in the diagram below, the gray unit represents _____.

RNA

DNA

None of these

Answer

Correct Answer: RNA

Note: This Question is unanswered, help us to find answer for this one

333. Linked genes are usually ________.

Codominant

Found on the Y chromosome

Located close together on a chromosome

Found on the X chromosome

Answer

Correct Answer: Located close together on a chromosome

Note: This Question is unanswered, help us to find answer for this one

334. A phenotype can consist of _ as well as _ characteristics.

1 in 10

First half

Evocative genotype-environment

Physical; psychological

Answer

Correct Answer: Physical; psychological

Note: This Question is unanswered, help us to find answer for this one

335. A mutation can cause a change __________.

In the shape of a protein, in the amino acid sequence of a protein, in the way the cell cycle is regulated that is beneficial to the cell

In the shape of a protein, in the amino acid sequence of a protein

In the shape of a protein

Answer

Correct Answer: In the shape of a protein, in the amino acid sequence of a protein, in the way the cell cycle is regulated that is beneficial to the cell

Note: This Question is unanswered, help us to find answer for this one

336. __________ function(s) as the template during translation.

Transcription

Messanger rna

Transfer rna

Ribosomal rna

Answer

Correct Answer: Messanger rna

Note: This Question is unanswered, help us to find answer for this one

337. The tata box is a that allows for the binding of and __.

Eukaryotic promoter; transcription factors; ribozymes

Prokaryotic promoter; translation factors; ribosome

Eukaryotic promoter; transcription factors; RNA polymerase II

Prokaryotic promoter; transcription factors; RNA polymerase II

Eukaryotic promoter; translation factors; ribosome

Answer

Correct Answer: Eukaryotic promoter; transcription factors; RNA polymerase II

Note: This Question is unanswered, help us to find answer for this one

338. The strand of dna that is not transcribed is called the ______ strand.

Coding

Non-coding

Replicate

Inert

Answer

Correct Answer: Coding

Note: This Question is unanswered, help us to find answer for this one

339. The sos dna repair system is __________.

It can be copied, transcribed, and translated into a desired protein.

A last ditch effort to prevent cell death from large amounts of damage.

They cut DNA at sites, called recognition sites, that have specific nucleotide sequences.

Stay healthy, because their immune systems can kill this strain easily

Answer

Correct Answer: A last ditch effort to prevent cell death from large amounts of damage.

Note: This Question is unanswered, help us to find answer for this one

340. The relationship between a gene and a messenger rna is that ________.

MRNAs are made from genes

All genes are made from mRNAs

MRNAs make proteins, which then code for genes

MRNA is directly responsible for making Okazaki fragments

Genes are made from mRNAs

Answer

Correct Answer: MRNAs are made from genes

Note: This Question is unanswered, help us to find answer for this one

341. The radioactive isotope 32p labels the t2 phage's _____.

DNA

RNA

Both

None of these

Answer

Correct Answer: DNA

Note: This Question is unanswered, help us to find answer for this one

342. The product of the p53 gene _____.

Causes cells to reduce expression of genes involved in DNA repair

Allows cells to pass on mutations due to DNA damage

Slows down the rate of DNA replication by interfering with the binding of DNA

Polymerase

Inhibits the cell cycle

Answer

Correct Answer: Inhibits the cell cycle

Note: This Question is unanswered, help us to find answer for this one

343. The process of ________ is described as semiconservative.

Translation

Transcription

Mismatch repair

Transformation

DNA replication

Answer

Correct Answer: DNA replication

Note: This Question is unanswered, help us to find answer for this one

344. The disproportionately high appearance of polydactylism among the amish suggests that _______.

It is a common mutation

It is a common birth defect in Pennsylvania

It was overrepresented in the gene pool of the original Amish settlers

Humans are prone to this birth defect

Answer

Correct Answer: It was overrepresented in the gene pool of the original Amish settlers

Note: This Question is unanswered, help us to find answer for this one

345. The discontinuous aspect of replication of dna in vivo is caused by ________.

Polymerase slippage

Trinucleotide repeats

The 5' to 3' polarity restriction

Topoisomerases cutting the DNA in a random fashion

Sister-chromatid exchanges

Answer

Correct Answer: The 5' to 3' polarity restriction

Note: This Question is unanswered, help us to find answer for this one

346. The collection of _____ in a population constitutes that population's gene pool.

Hybrid infertility

Allele frequency

Alleles

None of these

Answer

Correct Answer: Alleles

Note: This Question is unanswered, help us to find answer for this one

347. Telomerase reads as a template and synthesizes as a product.

RNA; DNA

DNA; DNA

RNA; RNA

DNA; RNA

Answer

Correct Answer: RNA; DNA

Note: This Question is unanswered, help us to find answer for this one

348. Sympatric speciation is _____. see concept 24.2 (page 511)

Reduced hybrid viability

The appearance of a new species in the same area as the parent population

Punctuated equilibrium

Sympatric speciation and polyploidy

Answer

Correct Answer: The appearance of a new species in the same area as the parent population

Note: This Question is unanswered, help us to find answer for this one

349. Stem canker, cyst nematodes and late foliar disease are major diseases of__________ in brazil.

Soybeans

Maize

Green beans

Safrinha

Answer

Correct Answer: Soybeans

Note: This Question is unanswered, help us to find answer for this one

350. Starting around age ___, organ size and efficiency begin to decrease.

Answer

Correct Answer: 30

Note: This Question is unanswered, help us to find answer for this one

351. Shown below is a ribosome in the process of translation. the p site of a ribosome _____.

Deliver amino acids to their proper site during protein synthesis

Holds the growing polypeptide chain

Manufactured proteins to be short and defective

The information for making a polypeptide

Answer

Correct Answer: Holds the growing polypeptide chain

Note: This Question is unanswered, help us to find answer for this one

352. Separation of sister chromatids occurs _______.

At anaphase in mitosis and anaphase II in meiosis

Rough endoplasmic reticulum and ribosomes

Metaphase chromosomes

Anaphase II

Reciprocal exchange of DNA between homologs during prophase I

Answer

Correct Answer: At anaphase in mitosis and anaphase II in meiosis

Note: This Question is unanswered, help us to find answer for this one

353. Scientists have found that _____.

Genetic diversity decreased as early humans migrated away from Africa and founded new populations

Sperm do not contribute their mitochondria to the zygote.

All humans alive today are related to a single female ancestor

The ability to walk upright preceded the evolution of a larger brain

Answer

Correct Answer: Genetic diversity decreased as early humans migrated away from Africa and founded new populations

Note: This Question is unanswered, help us to find answer for this one

354. Replication of dna begins at a/n ___ rich area.

Uracil-adenine

Guanine-cytosine

Adenine-cytosine

Guanine-adenine

Adenine-thymine

Answer

Correct Answer: Adenine-thymine

Note: This Question is unanswered, help us to find answer for this one

355. Prototrophs are bacteria that can grow on ________ medium.

Auxotrophs

Prototrophs

Minimal

F+ cells

Answer

Correct Answer: Minimal

Note: This Question is unanswered, help us to find answer for this one

356. On any given_____, there are a number of genes, but not all the genes will be coding for proteins.

Tumor

Chromosome

Helix

Nucleotide

Answer

Correct Answer: Chromosome

Note: This Question is unanswered, help us to find answer for this one

357. Most recessive genetic disorders are _____.

On the autosomes

X-linked

Additive

Polygenic

Answer

Correct Answer: On the autosomes

Note: This Question is unanswered, help us to find answer for this one

358. Most of the known single-gene disorders are _____.

Severe dominant disorder

Dominant

Seriously disabling

None of these

Answer

Correct Answer: Dominant

Note: This Question is unanswered, help us to find answer for this one

359. Most human variation is due to _____ traits.

Trait L

Complex

Normal

None of these

Answer

Correct Answer: Complex

Note: This Question is unanswered, help us to find answer for this one

360. Morgan's analysis of a white-eyed male drosophila mutation helped explain ________.

Autosomal dominance

Independent assortment

X-linked inheritance

Crossing over

Random mutation

Answer

Correct Answer: X-linked inheritance

Note: This Question is unanswered, help us to find answer for this one

361. Microinsertions and microdeletions often result in ________ mutations.

Silent

Frameshift

Auxotrophic

Advantageous

Answer

Correct Answer: Frameshift

Note: This Question is unanswered, help us to find answer for this one

362. Introns are ______.

DNA sequences to which silencers bind

DNA sequences to which activators bind

Noncoding DNA sequences

Expressed DNA sequences

The product of RNA splicing

Answer

Correct Answer: Noncoding DNA sequences

Note: This Question is unanswered, help us to find answer for this one

363. Inbreeding can lead to a decrease in genetic diversity and _____.

Hybrid infertility

Allele frequency

All of these

Inbreedng depression

Answer

Correct Answer: Inbreedng depression

Note: This Question is unanswered, help us to find answer for this one

364. In transcription, ________.

The mRNA produced is complementary to one strand of the DNA

Both strands of the DNA are copied

Uracil pairs with thymine

A double helix containing one parent strand and one daughter strand is produced

The mRNA produced is identical to the parent DNA

Answer

Correct Answer: The mRNA produced is identical to the parent DNA

Note: This Question is unanswered, help us to find answer for this one

365. In the united states, about _ of the population is overweight; more than _ are obese.

One-thirds; half

Two-thirds; half

One-thirds; a quarter

Two-thirds; a quarter

Answer

Correct Answer: Two-thirds; a quarter

Note: This Question is unanswered, help us to find answer for this one

366. In the lactose operon of e. coli, the crp-camp complex is a(n) _____ of transcription.

Positive regulator

Enhancer

Silencer

Negative regulator

Answer

Correct Answer: Positive regulator

Note: This Question is unanswered, help us to find answer for this one

367. In the hardy-weinberg equation, p and q are _____.

Mutation rates

Phenotypes

Genotypes

Measures of fitness

Allele frequencies

Answer

Correct Answer: Allele frequencies

Note: This Question is unanswered, help us to find answer for this one

368. In the control of gene expression in bacteria, a regulatory gene __________.

Is transcribed continuously

Is not contained in the operon it controls

Has its own promoter

Codes for repressor proteins.

All of the listed responses are correct.

Answer

Correct Answer: All of the listed responses are correct.

Note: This Question is unanswered, help us to find answer for this one

369. In the _ of lactose, the lac binds to the lac ___ site.

Ribosomes

Transcription factor binding

Absence; repressor; operator

Provides a site for the repressor to bind

Answer

Correct Answer: Absence; repressor; operator

Note: This Question is unanswered, help us to find answer for this one

370. In prokaryotes, operons _____.

Regulate the catalytic activities of specific proteins

Regulate the rate of transcription of a set of genes

Phosphorylate specific polypeptide chains

Transcribe structural genes

Answer

Correct Answer: Regulate the rate of transcription of a set of genes

Note: This Question is unanswered, help us to find answer for this one

371. In pcr, _______ creates single-stranded dna template molecules.

Heat

High salt concentration

DNA polymerase

Exonuclease

A primer

Answer

Correct Answer: Heat

Note: This Question is unanswered, help us to find answer for this one

372. In gene-cloning projects, plasmids function to ______.

Recognized by restriction enzymes

Allow replication of the DNA thats being cloned

Plasmid and bacterial cell replication

Probe the library using a labeled single-stranded DNA complementary to the gene

Answer

Correct Answer: Allow replication of the DNA thats being cloned

Note: This Question is unanswered, help us to find answer for this one

373. In eukaryotic cells the first step in protein synthesis is the _____.

Removal of introns from RNA and the stitching together of exons

Transferring of information from DNA to messenger RNA

Translation of an RNA nucleotide sequence into a sequence of amino acids

Translation of a DNA nucleotide sequence into a sequence of amino acids

Linking of nucleotides to form a polypeptide

Answer

Correct Answer: Transferring of information from DNA to messenger RNA

Note: This Question is unanswered, help us to find answer for this one

374. In eukaryotes, when mature mrna is hybridized to complementary dna, ______.

Exons loop out as single-stranded regions of DNA

Introns loop out as single-stranded regions of DNA

Introns loop out as single-stranded regions of RNA

Exons loop out as single-stranded regions of RNA

Answer

Correct Answer: Introns loop out as single-stranded regions of DNA

Note: This Question is unanswered, help us to find answer for this one

375. In eukaryotes, general transcription factors ________ .

Inactivation of the selected genes

Decreased chromatin condensation

Sets of regulatory proteins

Bind to other proteins or to the TATA box

Alternative forms of RNA splicing

Answer

Correct Answer: Bind to other proteins or to the TATA box

Note: This Question is unanswered, help us to find answer for this one

376. If there is 24% guanine in a dna molecule, then there is ________ cytosine.

52%

24%

48%

Impossible to determine

Answer

Correct Answer: 24%

Note: This Question is unanswered, help us to find answer for this one

377. If the dna in a cell consists of 20% adenine, then it will also contain ___ guanine.

40%

50%

30%

20%

Answer

Correct Answer: 30%

Note: This Question is unanswered, help us to find answer for this one

378. If an allele is dominant in one sex and recessive in another, it is an example of ___________.

Incomplete dominance

Codominance

Simple Mendelian inheritance

Sex-limited inheritance

Sex-influenced inheritance

Answer

Correct Answer: Sex-influenced inheritance

Note: This Question is unanswered, help us to find answer for this one

379. If a disease is caused by a dominant allele, it means that a person with the disease ________.

In the sequence of bases

Polygenic inheritance.

Huntington disease

Could be either homozygous or heterozygous for the allele

Hydrogen bonds between bases

Answer

Correct Answer: Could be either homozygous or heterozygous for the allele

Note: This Question is unanswered, help us to find answer for this one

380. Hiv and phage lambda both __________.

Surrounds the nucleic acid of a virus

Integrate their DNA into the host's chromosome

Considered to be alive

Moves from the nucleus to the cytoplasm following RNA processing

Answer

Correct Answer: Integrate their DNA into the host's chromosome

Note: This Question is unanswered, help us to find answer for this one

381. Genetic variation in bacterial populations cannot result from __________.

Transformation

Transduction

Meiosis

Conjugation

Mutation

Answer

Correct Answer: Meiosis

Note: This Question is unanswered, help us to find answer for this one

382. Genetic variation _____

Is created by the direct action of natural selection

Must be present in a population before natural selection can act upon the population

Tends to be reduced by when diploid organisms produce gametes

Arises in response to changes in the environment

Answer

Correct Answer: Must be present in a population before natural selection can act upon the population

Note: This Question is unanswered, help us to find answer for this one

383. Genetic drift produces variation for evolution when ________.

A gene pool decreases because a smaller group establishes a new population

Chance events cause allele frequencies to fluctuate unpredictably

Sudden change in environment drastically reduces the gene pool

A population has heritable traits better suited to the environment

Answer

Correct Answer: Chance events cause allele frequencies to fluctuate unpredictably

Note: This Question is unanswered, help us to find answer for this one

384. Genetic drift is the result of ______.

Chance

Environmental variation

Natural selection

A large gene pool

Differential reproductive success.

Answer

Correct Answer: Chance

Note: This Question is unanswered, help us to find answer for this one

385. Genetic drift is _____.

An important microevolutionary mechanism in large populations

The mechanism by which new alleles originate

More likely to have an impact on small populations

Adaptive

Answer

Correct Answer: More likely to have an impact on small populations

Note: This Question is unanswered, help us to find answer for this one

386. Genes provide the information needed to produce _____ in the cell.

Enzymes

Lipids

Ribosomes

Glucose

Answer

Correct Answer: Enzymes

Note: This Question is unanswered, help us to find answer for this one

387. Gene flow is accomplished by ______.

Genetic drift

Sexual recombination

Mutation

Migration

Natural selection

Answer

Correct Answer: Migration

Note: This Question is unanswered, help us to find answer for this one

388. Eric has blue eyes. since the gene for blue eyes is recessive, eric must be ______ for that trait.

Dizygotic

Embryonic

Monozygotic

Homozygous

Answer

Correct Answer: Homozygous

Note: This Question is unanswered, help us to find answer for this one

389. Environmental factors typically influence inheritance of ________.

Multiple alleles

Codominance

Trihybrid crosses

Polygenic traits

Answer

Correct Answer: Polygenic traits

Note: This Question is unanswered, help us to find answer for this one

390. Each round of pcr ______.

Increases the amount of DNA by 2n, where n = primer length

Doubles the amount of DNA

Increases the amount of DNA by 2n, where n = reaction temperature

Cuts a new set of DNA fragments

Answer

Correct Answer: Doubles the amount of DNA

Note: This Question is unanswered, help us to find answer for this one

391. During translation, _ is synthesized in the _.

DnaA, opens the complex

Exons, introns

Nucleus, introns

Polypeptides, mRNA sequences and cellular machinery

Answer

Correct Answer: Polypeptides, mRNA sequences and cellular machinery

Note: This Question is unanswered, help us to find answer for this one

392. During the transcription of a given portion of a dna molecule _____.

Manufactured proteins to be short and defective

During transcription

A silent or neutral mutation

Cleavage of a polypeptide into two or more chains

MRNA is synthesized on only one of the chains

Answer

Correct Answer: MRNA is synthesized on only one of the chains

Note: This Question is unanswered, help us to find answer for this one

393. During telophase ______.

Carry genes controlling the same inherited characteristics

Homologous chromosomes line up in the middle of the cell

The events of prophase are reversed

Chromosomes line up in the middle of the cell

Answer

Correct Answer: The events of prophase are reversed

Note: This Question is unanswered, help us to find answer for this one

394. During replication dna _____

Remains intact

Makes rna

Is copied

Directs protein synthesis

Answer

Correct Answer: Is copied

Note: This Question is unanswered, help us to find answer for this one

395. Disruptive selection favors individuals at ______ of variation

One extreme

Both extremes

In the middle

None of the above

Answer

Correct Answer: Both extremes

Note: This Question is unanswered, help us to find answer for this one

396. Crossing over ____________ the number of recombinant offspring.

Decreases

Not assort independently.

Increases

Coupling

Answer

Correct Answer: Increases

Note: This Question is unanswered, help us to find answer for this one

397. Crossing over genes into assortments of not found in the parents.

Recombines linked; alleles

Combines unlinked; alleles

Combines linked; genes

Recombines unlinked; genes

Answer

Correct Answer: Recombines linked; alleles

Note: This Question is unanswered, help us to find answer for this one

398. Codons are base pair sequences that ________.

Prevent mRNA synthesis

Code for amino acids

Alterations in the DNA base sequence

Deoxyadenosine

Answer

Correct Answer: Code for amino acids

Note: This Question is unanswered, help us to find answer for this one

399. Brca1 and brca2 are considered to be tumor-suppressor genes because _____.

Turned off whenever tryptophan is added to the growth medium.

Starts when the pathway's substrate is present.

Their normal products participate in repair of DNA damage.

The occurrence of mRNAs for the production of tissue-specific proteins

Answer

Correct Answer: Their normal products participate in repair of DNA damage.

Note: This Question is unanswered, help us to find answer for this one

400. Bergman’s rule suggests that there is a correlation between temperature and ________________.

Size

Pressure

Space

Mass

Answer

Correct Answer: Size

Note: This Question is unanswered, help us to find answer for this one

401. Bacterial dna polymerase i does not have ________ activity?

3' to 5' exonuclease activity

5' to 3' exonuclease activity

Endonuclease activity

5' to 3' DNA synthesis activity

Answer

Correct Answer: Endonuclease activity

Note: This Question is unanswered, help us to find answer for this one

402. An mrna molecule has 540 codons. it must have at least _______ nucleotides.

180

270

540

1,080

1,620

Answer

Correct Answer: 1,620

Note: This Question is unanswered, help us to find answer for this one

403. All of the following conditions are required for hardy-weinberg equilibrium except __________.

Duplication

Natural selection

Balancing selection

Mutation

Human fingerprints

Answer

Correct Answer: Natural selection

Note: This Question is unanswered, help us to find answer for this one

404. All of the following are related to telomeres except __________.

Telomerase enzyme

Links to the aging process

Being found in eukaryotes and prokaryotes

Short tandem repeats located at the ends of telomeres

Answer

Correct Answer: Being found in eukaryotes and prokaryotes

Note: This Question is unanswered, help us to find answer for this one

405. All of the following are required in complementation testing in yeast except _______.

Mutations that are recessive

Diploid cells

Two or more mutations that affect a single phenotype

An auxotrophic organism

Answer

Correct Answer: An auxotrophic organism

Note: This Question is unanswered, help us to find answer for this one

406. "all of the following are dna sequencing techniques except _____. select all that apply.

DNA fingerprinting

Maxam and Gilbert method

Chain termination method

Mullis chain-terminating sequencing

Answer

Correct Answer: DNA fingerprinting
Mullis chain-terminating sequencing

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

407. According to chargaff's rules, _ always pairs with , and _ always pairs with ___.

A; G; T; C

A; T; G; C

A; C; G; T

C; T; G; A

G; U; A; C

Answer

Correct Answer: A; T; G; C

Note: This Question is unanswered, help us to find answer for this one

408. Aabb × aabb is an example of ____.

Fertilization

DNA polymerase

Incomplete dominance

MRNA, tRNA, rRNA

A dihybrid cross

Answer

Correct Answer: A dihybrid cross

Note: This Question is unanswered, help us to find answer for this one

409. A stretch of 150 nucleotides in a coding region would code for _______ codons.

150

450

750

Answer

Correct Answer: 50

Note: This Question is unanswered, help us to find answer for this one

410. A robertsonian translocation is considered non-reciprocal because _______.

A copy of the insertion sequence becomes integrated at a new location

Two haploid gametes fuse to form a diploid cell

The smaller of the two reciprocal products of translocated chromosomes is lost

They may be sterile and unable to produce offspring.

Answer

Correct Answer: The smaller of the two reciprocal products of translocated chromosomes is lost

Note: This Question is unanswered, help us to find answer for this one

411. A ribozyme is __________.

An RNA molecule that functions as an enzyme

The location in a cell where ribosomal RNAs (rRNAs) are made

An example of rearrangement of exons caused by alternative RNA splicing

An exception to the one gene-one enzyme hypothesis

A cutting enzyme involved in DNA damage repair

Answer

Correct Answer: An RNA molecule that functions as an enzyme

Note: This Question is unanswered, help us to find answer for this one

412. A plasmid differs from the bacterial chromosome in that it is __________.

Plasmids contain genes that are NOT essential for cellular growth and replication.

Catalyze the formation of phosphodiester bonds between ribonucleotides.

Additional genetic traits that are needed only under certain circumstances

Allows coordinated expression of multiple related genes in prokaryotes.

Answer

Correct Answer: Plasmids contain genes that are NOT essential for cellular growth and replication.

Note: This Question is unanswered, help us to find answer for this one

413. A plant with the genotype aabbcc is __________.

Homozygous recessive individual

Homozygous for two different genes

The gene for hemophilia is sex-linked

All of the dominant phenotype

Answer

Correct Answer: Homozygous for two different genes

Note: This Question is unanswered, help us to find answer for this one

414. A phenotypic ratio of 9:3:3:1 in the offspring of a cross indicates that _____.

Both parents are heterozygous for both genes

Calculate the probability of a child having either sickle-cell anemia or cystic fibrosis if parents are each heterozygous for both.

In rabbits and many other mammals, one genotype (ee) prevents any fur color from developing.

Skin pigmentation in humans

Answer

Correct Answer: Both parents are heterozygous for both genes

Note: This Question is unanswered, help us to find answer for this one

415. A monohybrid cross is made between plants that _____.

Have experienced only one hybrid generation

Differ in only one trait

Are identical

Are self-pollinated

Answer

Correct Answer: Differ in only one trait

Note: This Question is unanswered, help us to find answer for this one

416. A human female has _ chromosomes in each skin cell and _ chromosomes in each egg.

46; 23

23; 46

46; 46

23; 23

Answer

Correct Answer: 46; 23

Note: This Question is unanswered, help us to find answer for this one

417. A genetic locus has two alleles. one has a frequency of 0.12; the other has a frequency of _______.

0.81

0.88

0.89

0.87

Answer

Correct Answer: 0.88

Note: This Question is unanswered, help us to find answer for this one

418. A gene made of is transcribed into and then translated to form a __.

DNA ... RNA ... protein

U ... A....D

DNA → RNA → protein

Substitution of one nucleotide

Answer

Correct Answer: DNA ... RNA ... protein

Note: This Question is unanswered, help us to find answer for this one

419. A gene is usually _____.

The same thing as a chromosome

The information for making a polypeptide

Made of RNA

Made by a ribosome

Answer

Correct Answer: The information for making a polypeptide

Note: This Question is unanswered, help us to find answer for this one

420. A dominant allele is best defined as ________.

An allele that stops or hides the expression of the other allele

The person has two identical alleles for the gene responsible for the trait

Carriers are not eliminated by the disease before passing the defective alleles on to their offspring

Incomplete dominance

Phenotype

Answer

Correct Answer: An allele that stops or hides the expression of the other allele

Note: This Question is unanswered, help us to find answer for this one

421. A ddntp, used often in dna sequencing, lacks a(n) at the and carbons.

True

OH; 2'; 3'

DNA sequencing

Filter-bound DNA

Answer

Correct Answer: OH; 2'; 3'

Note: This Question is unanswered, help us to find answer for this one

422. A cross that involves two traits is called a ______ cross.

Monohybrid

Dihybrid

Punnett

Test

Homozygous

Answer

Correct Answer: Dihybrid

Note: This Question is unanswered, help us to find answer for this one

423. A change from uug to uag would thus be a(n) _______ mutation.

Silent; missense

Nonsense; silent

Frame-shift; missense

Silent; nonsense

Nonsense; frame-shift

Answer

Correct Answer: Silent; nonsense

Note: This Question is unanswered, help us to find answer for this one

424. A 1:1:1:1 ratio of offspring from a dihybrid testcross indicates that ___________.

The genes are not linked or are more than 50 map units apart.

Have the same order of genes but different intergenic distances.

Recessive, and that these genes are located 4 map units apart.

None of these

Answer

Correct Answer: The genes are not linked or are more than 50 map units apart.

Note: This Question is unanswered, help us to find answer for this one

425. is to transcription as are to translation.

Alternative splicing ; pre-mRNA

RNA polymerase; ribosomes

Ribosomes ; RNA polymerase

Pre-mRNA ;RNA polymerase

Answer

Correct Answer: RNA polymerase; ribosomes

Note: This Question is unanswered, help us to find answer for this one

426. ____ is an accessory protein that acts to chaperone nucleosome assembly.

Histone 3.3

Nucleoplasmin/N1

Histone H1

CAF1/Asf1

Answer

Correct Answer: Nucleoplasmin/N1

Note: This Question is unanswered, help us to find answer for this one

Biology MCQs | Topic-wise

MCQ on Biodiversity	MCQ on Botany
MCQ on Campbell Biology	MCQ on Cardiovascular System
MCQ on Ecology	MCQ on Immune system
MCQ on Introduction To Biology	MCQ on Mastering Biology
MCQ on Organismic Biology	MCQ on Pharmacology
General Biology MCQs

Buy us a coffee

Biology Subjects

Zoology MCQs

Biochemistry MCQs

Biological History MCQs

General Biology MCQs

Botany MCQs

Cell Biology MCQs

Microbiology MCQs

Ecology MCQs

Anatomy and Physiology MCQs

Immunology MCQs

Bioinformatics MCQs

Developmental Biology MCQs

Psychobiology MCQs

Systematics MCQs

Evolutionary Biology MCQs

Virology MCQs

Sexuality MCQs

Biotechnology MCQs

Nervous System MCQs

Agricultural Biology MCQs

Digestive System MCQs

Muscle Tissue MCQs

Plant And Soil Science MCQs

Origin of Species MCQs

Vertebrates Dynamic MCQs

Osmosis MCQs

Mastering Biology MCQs

Environmental Biology MCQs

Pharmacology MCQs

Organelles MCQs

Cardiovascular System MCQs

Organismic Biology MCQs

Neurobiology MCQs

Biosynthesis MCQs

Immune system MCQs

DNA Replication MCQs

Pathology MCQs

Histology MCQs

Aquatic Ecosystem MCQs

Metabolism MCQs

Renal System MCQs

Paleontology MCQs

Kinesiology MCQs

Urology MCQs

Campbell Biology MCQs

Phlebotomy MCQs

Photosynthesis MCQs

Biodiversity MCQs

Molecular Biology MCQs

Parasitology MCQs

Enzyme MCQs

Introduction To Biology MCQs

Mycology MCQs

Basic Biology MCQs

More Resources

Biology MCQ

Biology Skill Assessment

Biology PDF

Related MCQs

Business Statistics MCQs

Chemical Science MCQs

Chemistry MCQs

General Science MCQs

Geology MCQs

Genetics MCQ

1. The __________ stops materials from moving between cells across an epithelium.

2. Transcription normally stops when the _____.

3. In the diagram below, the two blue strands represent _____.

4. In rna the nitrogenous base uracil pairs with ______ in dna

5. In general, the phenotypes of a complex trait should exhibit a(n) _____ distribution.

6. In evolutionary terms, an organism's fitness is measured by its _____. see concept 23.4 (page 495)

7. The cross-fertilization of two different varieties of pea plants will produce a(n) _____.

8. The bottleneck event that decimated the bison was caused by _______.

9. Polydactylism occurs _______.

10. Point mutations in noncoding regions of dna result in __________.

11. The enzyme that accomplishes transcription is termed ______.

12. In drosophila, the ratio of x chromosomes to autosomes directly influences _______.

13. Removal of ____ turns genes off.

14. Red-green color blindness and _____ are known to be inherited as x-linked recessive traits.

15. Recessive alleles are best defined as ________.

16. A homozygous dominant germ cell undergoes meiosis. the gametes will _________________________.

17. A family tree that describes traits in families is called a __________.

18. In 1859, naturalist ______________ suggested an explanation for why evolution occurs.

19. If someone says "there is a flu epidemic", this is analogous to saying ______.

20. Identical twins occur when a(n) ____ divides to form two separate, individual cells.

21. Bacterial plasmids are of particular interest to biotechnologists because plasmids __________.

22. Animal bodies are organized along the ____________ axes.

23. The overall error rate in the completed dna molecule is approximately __________.

24. When fisheries managers move fish from one lake to another, this causes gene ______.

25. We can better understand our ancestry by analyzing the __________ in males.

26. Transcription and replication occur during ____________________ of the cell cycle.

27. The secondary form of inheritance via epigenetics is sometimes referred to as ______ inheritance.

28. The mc1r gene________________. choose all that apply.

29. The inheritance of height and weight can best be described as __________.

30. The first basic idea of evolutionary adaptation can be traced back to _____.

31. Telomerase is fully active in _____ and _____ cells, but almost completely inactive in _____ cells.

32. Sexual recombination includes the shuffling of chromosomes in __________ and fertilization.

33. Natural selection generally results in ________.

34. Mutation is the only evolutionary mechanism that _____.

35. A(n) _______ is a characteristic arising from genes located on gender-determining chromosomes.

36. Gene expression involves two phases, ___________ and translation.

37. Fetal cells may be removed along with fluid from the womb by a process known as __________.

38. A pedigree chart like this one is characteristic of _________________ disorders.

39. A mutation that knocked out the proofreading function of dna polymerase would result in __________.

40. Closed chest injuries are typically caused by _______.

41. When a baby is born, the zygote has become about _____ billion cells.

42. Tafs ___ and ___ make contact with the initiator region of the promoter.

43. A qtl is a __________ where one or more genes affecting a quantitative trait are ________ .

44. Strand discrimination during the process of _____________ is based on dna methylation in e. coli.

45. A(n) _____ that carries the chromosomes x and y is male, and one with two x chromosomes is female.

46. The sum of histone modifications and their interactions is called the ________.

47. Evolutionary psychologists are most directly concerned with the impact of ________ on behavior.

48. Epigenetics is the study of environmental influences on ______ that occur without a dna change.

49. Translation is directly dependent on all of the following associations except _______.

50. Conserved developmental genes can lead to _______ evolution.

51. Expression of ______ would inhibit x-inactivation.

52. Chi-square analysis can help us to decide whether __________.

53. Small noncoding rnas (ncrnas) called piwi-interacting rnas, or pirnas, __________.

54. Research on laboratory animals indicates that cannabinoids are most effective if taken ____.

55. Viral chromosomes exist in a variety of conformations and can be made up of ________.

56. The production of gene families, such as the globin genes is the result of ________.

57. The lac operon is optimally expressed _____.

58. The genetic code is said to be triplet, meaning that there ________.

59. Most e. coli antisense rnas work with a protein called ______ to regulate their target mrnas.

60. A major difference between mendelian and quantitative traits is in _______________

61. Contracts involving fraud in inducement are ________.

62. In traditional cultures, prenatal massage __________.

63. Anticodons, codons, and base triplets correspond to __________ respectively.

64. In terms of its involvement in mutagenesis, 5bu is best described as _______.

65. After translation, a protein may undergo structural changes called __________ modifications.

66. Pedigrees and blood tests are both means of __________.

67. The y chromosomes of mammals contain genes that code for _____.

68. In a monohybrid cross, f2 refers to __________.

69. According to current evidence, pluto is best explained as ______.

70. During the highlighted phase of mitosis, the chromosomes are ________.

71. Dns poisoning _____.

72. Dna polymerase i is thought to add nucleotides ________.

73. Hfr strains contain the f factor integrated into their ________, rather than in the __________.

74. Whenever diploid populations are in hardy-weinberg equilibrium at a particular locus, _____.

75. If mom's genotype is bb, her eggs will be ______.

76. When two genes fail to assort independently, the term normally applied is ________.

77. The bonds that hold trna molecules in the correct three-dimensional shape are __________.

78. In eukaryotic cells, transcription cannot begin until _____.

79. If you are a male, the law of independent assortment indicates that your gametes contain _____.

31. Telomerase is fully active in ___ and _ cells, but almost completely inactive in ___ cells.

42. Tafs _ and _ make contact with the initiator region of the promoter.

43. A qtl is a __ where one or more genes affecting a quantitative trait are .

73. Hfr strains contain the f factor integrated into their , rather than in the __.

96. The refers to the underlying genetic structure that leads to the observable .

117. Of the different possible codons, specify amino acids and signal stop.

119. Nonrandom mating tends to _ the frequencies of genotypes.

120. Mitochondrial dna is passed from _ to _.

126. Interactions among the human abo blood group alleles involve _ and __.

134. In dna, the two purines are , and the two pyrimidines are .

135. In a long dna molecule, each origin of replication produces a _ with a _ on each side.

138. Heterochromatin is _, whereas euchromatin is _.

149. Genes that are _ do not assort independently and are said to be _.