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Virology MCQ

A ________ assay is most useful for determining the viability of a viral preparation.

Direct (electron microscopic) count

Hemagglutination

Plaque

PCR

Answer

Correct Answer: Plaque

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Candidates for the original source of viral genomes include __________.

Transposons

Archaea

Plasmids and transposons

Plasmids

Plants

Bacteria

Answer

Correct Answer: Plasmids and transposons

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All of the following types of viruses have envelopes except __________.

Flavivirus

Poxvirus

Herpesvirus

Retrovirus

Rhabdovirus

Picornovirus

Answer

Correct Answer: Picornovirus

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The ________ of a virion determines the type of cell it enters.

Glycoproteins

Matrix proteins

Lipid molecules

Shape

Nucleic acid

Answer

Correct Answer: Glycoproteins

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The pointer is indicating the virus's _____.

Envelope -

Genome -

Mitochondria -

Capsid -

Microfilaments.

Answer

Correct Answer: Genome -

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The arrow is indicating _____.

Anterior belly of the digastric

Posterior belly of the digastric

Stylohyoid

Sternothyroid

Thyrohyoid

Answer

Correct Answer: Anterior belly of the digastric

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Viruses infecting ________ are typically the easiest to grow in the laboratory.

Plants

Animals

Fungi

Prokaryotes

Answer

Correct Answer: Prokaryotes

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Viruses can only be studied in detail using a(n) _____.

Stereo Microscope.

Compound Microscope.

Inverted Microscope.

Electron microscope

Answer

Correct Answer: Electron microscope

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Viruses can be grown in all of the following except __________.

Embryonated eggs

Tissue culture

Sterile nutrient agar

Live animals

Answer

Correct Answer: Sterile nutrient agar

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Viruses are often isolated from cells by filtration based upon the fact that they ______.

Form large aggregates that do not pass through the filter

Make the host cell sticky so it will bind to the filter and not pass through it

Bind to the filter, while cells pass through it

Are smaller than the pore size of the filter, so they pass through it

Answer

Correct Answer: Are smaller than the pore size of the filter, so they pass through it

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The host range of a virus is determined by _____

The enzymes carried by the virus

Whether its nucleic acid is DNA or RNA

The proteins in the host's cytoplasm

The proteins on its surface and that of the host

Answer

Correct Answer: The proteins on its surface and that of the host

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The genetic material of hiv consists of _____.

Single-stranded RNA

Double-stranded DNA

None of the above

Single-stranded DNA

Answer

Correct Answer: Single-stranded RNA

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Retroviruses require the activity of ________ to complete their infection cycle.

Reverse transcriptase

Double-stranded DNA

None of the above

Single-stranded DNA

Answer

Correct Answer: Reverse transcriptase

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Prions are that are thought to cause disease by .

Abnormally shaped proteins; inducing similar but normally shaped proteins in the brain to adopt the abnormal form

Whether its nucleic acid is DNA or RNA

The proteins in the host's cytoplasm

The proteins on its surface and that of the host

Answer

Correct Answer: Abnormally shaped proteins; inducing similar but normally shaped proteins in the brain to adopt the abnormal form

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Enveloped viral membranes are generally with associated virus-specific .

Lipid bilayers / phospholipids

Protein bilayers / lipids

Lipid bilayers / glycoproteins

Glycolipid bilayers / phospholipids

Answer

Correct Answer: Lipid bilayers / glycoproteins

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A single virus-infected cell may produce up to __________ new virions.

100

1000

10,000

One million

Answer

Correct Answer: 10,000

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were first identified in cancer-causing viruses and can induce in infected cells.

Herpes viruses; lesions

Oncogenes; transformation

T antigens; lysis

Glycoprotein spikes; syncytia formation

Answer

Correct Answer: Oncogenes; transformation

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Circular rna molecules that function like a virus in plants are termed __________.

Viroid

Lysogenic

Capsid

Lytic cycle

Answer

Correct Answer: Viroid

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A gene for a __________ is likely to be encoded in the viral genome.

Restriction endonuclease

Capsid protein

Ribosomal RNA

Ribosomal protein

Answer

Correct Answer: Capsid protein

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Click on the diagram to start the animation. The arrow is indicating a prophage

Viral DNA incorporated into host DNA is referred to as a "prophage"

Viral protein coat

The viral protein coat surrounds its genome.

Rupture of the bacterium

The bacterium ruptures and phages are released.

None of these

Answer

Correct Answer: Viral DNA incorporated into host DNA is referred to as a "prophage"

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Click on the diagram to start the animation. the arrow is indicating _____.

The viral protein coat surrounds its genome

The bacterium ruptures and phages are released

Viral DNA incorporated into host DNA is referred to as a

None of these

Answer

Correct Answer: Viral DNA incorporated into host DNA is referred to as a

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This animation is illustrating an early stage of _____

The host cell's DNA is destroyed

The host cell's DNA is destroyed, and ultimately,

The host cell itself is destroyed in the lytic cycle.

The lysogenic cycle Integration of viral DNA into host DNA is an early stage of the lysogenic cycle

Answer

Correct Answer: The lysogenic cycle Integration of viral DNA into host DNA is an early stage of the lysogenic cycle

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A prophage is a(n) __________.

RNA information that is copied into DNA

Lysogenic

Viral genome that has been incorporated into a bacterial cell's chromosome

Harmless derivatives of pathogenic viruses

Answer

Correct Answer: Viral genome that has been incorporated into a bacterial cell's chromosome

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Virus replication results in the death of the cell in ________ infection(s).

Lysogenic

Lytic

Persistent

Latent

Answer

Correct Answer: Lytic

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Viral dna makes mrna by the process of _____.

Replication.

Infection.

Translation.

Lysis.

Transcription

Answer

Correct Answer: Transcription

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The virus genome and viral proteins are assembled into virions (virus particles) during _____.

The lytic cycle and the lysogenic cycle in all known host organisms

The lysogenic cycle only

The lytic cycle only

The lytic cycle in all host organisms but the lysogenic cycle only in bacteria

Answer

Correct Answer: The lytic cycle only

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Reverse transcriptase catalyzes _ production from a _ template.

RNA; protein

Protein; RNA

RNA; DNA

DNA; RNA

Answer

Correct Answer: DNA; RNA

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Polioviruses are present in body tissues in all of the following except __________.

Asymptomatic infections

Nonparalytic polio

Postpolio syndrome

Paralytic polio

Answer

Correct Answer: Postpolio syndrome

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In the lysogenic cycle _____

Viral protein coat

Influenza A, B, and C

Viral DNA is replicated along with host DNA

It catalyzes the formation of DNA from an RNA template.

The host cell's DNA is destroyed

Answer

Correct Answer: Viral DNA is replicated along with host DNA

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In a lytic cycle of replication, release of phages involves _____.

Exocytosis of phages across the cell wall

Keeping the host cell alive

The bacterial cell bursting open

Contact with another uninfected bacterium

Answer

Correct Answer: The bacterial cell bursting open

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Cycle a is the _ cycle and cycle b is the _ cycle.

Lytic ... lysogenic

Lysogenic ... lytic

Capsid ... lysogenic

Lytic ... capsid

Answer

Correct Answer: Lytic ... lysogenic

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Contact between a phage and its bacterial host occurs by _____.

Using phage tail fibers

Using flagella

A random collision

Using jet-style propulsion

Answer

Correct Answer: A random collision

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A temperate phage is a phage that is capable of __________.

Uses viral RNA as a template for DNA synthesis

Replicating by both the lytic cycle and the lysogenic cycle

RNA polymerase coded by viral genes and carried in the viral capsid

Inheritance of an infection from a parent

Answer

Correct Answer: Replicating by both the lytic cycle and the lysogenic cycle

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Virology MCQ

A ________ assay is most useful for determining the viability of a viral preparation.

Candidates for the original source of viral genomes include __________.

All of the following types of viruses have envelopes except __________.

The ________ of a virion determines the type of cell it enters.

The pointer is indicating the virus's _____.

The arrow is indicating _____.

Viruses infecting ________ are typically the easiest to grow in the laboratory.

Viruses can only be studied in detail using a(n) _____.

Viruses can be grown in all of the following except __________.

Viruses are often isolated from cells by filtration based upon the fact that they ______.

The host range of a virus is determined by _____

The genetic material of hiv consists of _____.

Retroviruses require the activity of ________ to complete their infection cycle.

Prions are __________ that are thought to cause disease by __________.

Enveloped viral membranes are generally ________ with associated virus-specific ________.

A single virus-infected cell may produce up to __________ new virions.

________ were first identified in cancer-causing viruses and can induce ________ in infected cells.

Circular rna molecules that function like a virus in plants are termed __________.

A gene for a __________ is likely to be encoded in the viral genome.

Click on the diagram to start the animation. The arrow is indicating a prophage

Click on the diagram to start the animation. the arrow is indicating _____.

This animation is illustrating an early stage of _____

A prophage is a(n) __________.

Virus replication results in the death of the cell in ________ infection(s).

Viral dna makes mrna by the process of _____.

The virus genome and viral proteins are assembled into virions (virus particles) during _____.

Reverse transcriptase catalyzes _____ production from a _____ template.

Polioviruses are present in body tissues in all of the following except __________.

In the lysogenic cycle _____

In a lytic cycle of replication, release of phages involves _____.

Cycle a is the _____ cycle and cycle b is the _____ cycle.

Contact between a phage and its bacterial host occurs by _____.

A temperate phage is a phage that is capable of __________.

Prions are that are thought to cause disease by .

Enveloped viral membranes are generally with associated virus-specific .

were first identified in cancer-causing viruses and can induce in infected cells.

Reverse transcriptase catalyzes _ production from a _ template.

Cycle a is the _ cycle and cycle b is the _ cycle.