Virology MCQ
A ________ assay is most useful for determining the viability of a viral preparation.
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Candidates for the original source of viral genomes include __________.
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Correct Answer:
Plasmids and transposons
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All of the following types of viruses have envelopes except __________.
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Correct Answer:
Picornovirus
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The ________ of a virion determines the type of cell it enters.
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Correct Answer:
Glycoproteins
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The pointer is indicating the virus's _____.
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The arrow is indicating _____.
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Anterior belly of the digastric
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Viruses infecting ________ are typically the easiest to grow in the laboratory.
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Correct Answer:
Prokaryotes
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Viruses can only be studied in detail using a(n) _____.
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Correct Answer:
Electron microscope
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Viruses can be grown in all of the following except __________.
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Correct Answer:
Sterile nutrient agar
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Viruses are often isolated from cells by filtration based upon the fact that they ______.
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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 _____
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Correct Answer:
The proteins on its surface and that of the host
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The genetic material of hiv consists of _____.
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Correct Answer:
Single-stranded RNA
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Retroviruses require the activity of ________ to complete their infection cycle.
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Correct Answer:
Reverse transcriptase
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Prions are __________ that are thought to cause disease by __________.
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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 ________.
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Correct Answer:
Lipid bilayers / glycoproteins
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A single virus-infected cell may produce up to __________ new virions.
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________ were first identified in cancer-causing viruses and can induce ________ in infected cells.
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Correct Answer:
Oncogenes; transformation
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Circular rna molecules that function like a virus in plants are termed __________.
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A gene for a __________ is likely to be encoded in the viral genome.
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Correct Answer:
Capsid protein
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Click on the diagram to start the animation. The arrow is indicating a prophage
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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 _____.
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Viral DNA incorporated into host DNA is referred to as a
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This animation is illustrating an early stage of _____
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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) __________.
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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).
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Viral dna makes mrna by the process of _____.
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Transcription
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The virus genome and viral proteins are assembled into virions (virus particles) during _____.
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Correct Answer:
The lytic cycle only
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Reverse transcriptase catalyzes _____ production from a _____ template.
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Polioviruses are present in body tissues in all of the following except __________.
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Correct Answer:
Postpolio syndrome
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In the lysogenic cycle _____
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Correct Answer:
Viral DNA is replicated along with host DNA
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In a lytic cycle of replication, release of phages involves _____.
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Correct Answer:
The bacterial cell bursting open
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Cycle a is the _____ cycle and cycle b is the _____ cycle.
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Correct Answer:
Lytic ... lysogenic
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Contact between a phage and its bacterial host occurs by _____.
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Correct Answer:
A random collision
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A temperate phage is a phage that is capable of __________.
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Correct Answer:
Replicating by both the lytic cycle and the lysogenic cycle
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