Virology MCQs
Virology MCQs
Answer these VirologyMCQs and see how sharp is your knowledge of Virology. Scroll down and let's start!
1: A temperate phage is a phage that is capable of __________.
A. Uses viral RNA as a template for DNA synthesis
B. Replicating by both the lytic cycle and the lysogenic cycle
C. RNA polymerase coded by viral genes and carried in the viral capsid
D. Inheritance of an infection from a parent
2: Contact between a phage and its bacterial host occurs by _____.
A. Using phage tail fibers
B. Using flagella
C. A random collision
D. Using jet-style propulsion
3: Cycle a is the _____ cycle and cycle b is the _____ cycle.
A. Lytic ... lysogenic
B. Lysogenic ... lytic
C. Capsid ... lysogenic
D. Lytic ... capsid
4: In a lytic cycle of replication, release of phages involves _____.
A. Exocytosis of phages across the cell wall
B. Keeping the host cell alive
C. The bacterial cell bursting open
D. Contact with another uninfected bacterium
5: In the lysogenic cycle _____
A. Viral protein coat
B. Influenza A, B, and C
C. Viral DNA is replicated along with host DNA
D. It catalyzes the formation of DNA from an RNA template.
E. The host cell's DNA is destroyed
6: Polioviruses are present in body tissues in all of the following except __________.
A. Asymptomatic infections
B. Nonparalytic polio
C. Postpolio syndrome
D. Paralytic polio
7: Reverse transcriptase catalyzes _____ production from a _____ template.
A. RNA; protein
B. Protein; RNA
C. RNA; DNA
D. DNA; RNA
8: The virus genome and viral proteins are assembled into virions (virus particles) during _____.
A. The lytic cycle and the lysogenic cycle in all known host organisms
B. The lysogenic cycle only
C. The lytic cycle only
D. The lytic cycle in all host organisms but the lysogenic cycle only in bacteria
9: Viral dna makes mrna by the process of _____.
A. Replication.
B. Infection.
C. Translation.
D. Lysis.
E. Transcription
10: Virus replication results in the death of the cell in ________ infection(s).
A. Lysogenic
B. Lytic
C. Persistent
D. Latent
11: A prophage is a(n) __________.
A. RNA information that is copied into DNA
B. Lysogenic
C. Viral genome that has been incorporated into a bacterial cell's chromosome
D. Harmless derivatives of pathogenic viruses
12: This animation is illustrating an early stage of _____
A. The host cell's DNA is destroyed
B. The host cell's DNA is destroyed, and ultimately,
C. The host cell itself is destroyed in the lytic cycle.
D. The lysogenic cycle Integration of viral DNA into host DNA is an early stage of the lysogenic cycle
13: Click on the diagram to start the animation. the arrow is indicating _____.
A. The viral protein coat surrounds its genome
B. The bacterium ruptures and phages are released
C. Viral DNA incorporated into host DNA is referred to as a
D. None of these
14: Click on the diagram to start the animation. The arrow is indicating a prophage
A. Viral DNA incorporated into host DNA is referred to as a "prophage"
B. Viral protein coat
C. The viral protein coat surrounds its genome.
D. Rupture of the bacterium
E. The bacterium ruptures and phages are released.
F. None of these
15: A gene for a __________ is likely to be encoded in the viral genome.
A. Restriction endonuclease
B. Capsid protein
C. Ribosomal RNA
D. Ribosomal protein
16: Circular rna molecules that function like a virus in plants are termed __________.
A. Viroid
B. Lysogenic
C. Capsid
D. Lytic cycle
17: ________ were first identified in cancer-causing viruses and can induce ________ in infected cells.
A. Herpes viruses; lesions
B. Oncogenes; transformation
C. T antigens; lysis
D. Glycoprotein spikes; syncytia formation
18: A single virus-infected cell may produce up to __________ new virions.
A. 10
B. 100
C. 1000
D. 10,000
E. One million
19: Enveloped viral membranes are generally ________ with associated virus-specific ________.
A. Lipid bilayers / phospholipids
B. Protein bilayers / lipids
C. Lipid bilayers / glycoproteins
D. Glycolipid bilayers / phospholipids
20: Prions are __________ that are thought to cause disease by __________.
A. Abnormally shaped proteins; inducing similar but normally shaped proteins in the brain to adopt the abnormal form
B. Whether its nucleic acid is DNA or RNA
C. The proteins in the host's cytoplasm
D. The proteins on its surface and that of the host
21: Retroviruses require the activity of ________ to complete their infection cycle.
A. Reverse transcriptase
B. Double-stranded DNA
C. None of the above
D. Single-stranded DNA
22: The genetic material of hiv consists of _____.
A. Single-stranded RNA
B. Double-stranded DNA
C. None of the above
D. Single-stranded DNA
23: The host range of a virus is determined by _____
A. The enzymes carried by the virus
B. Whether its nucleic acid is DNA or RNA
C. The proteins in the host's cytoplasm
D. The proteins on its surface and that of the host
24: Viruses are often isolated from cells by filtration based upon the fact that they ______.
A. Form large aggregates that do not pass through the filter
B. Make the host cell sticky so it will bind to the filter and not pass through it
C. Bind to the filter, while cells pass through it
D. Are smaller than the pore size of the filter, so they pass through it
25: Viruses can be grown in all of the following except __________.
A. Embryonated eggs
B. Tissue culture
C. Sterile nutrient agar
D. Live animals
26: Viruses can only be studied in detail using a(n) _____.
A. Stereo Microscope.
B. Compound Microscope.
C. Inverted Microscope.
D. Electron microscope
27: Viruses infecting ________ are typically the easiest to grow in the laboratory.
A. Plants
B. Animals
C. Fungi
D. Prokaryotes
28: What is Virology?
A. The scientific study of biological viruses
B. The study of medicine
C. The study of cell biology
D. The study of factors which cause disease
29: What is a virus?
A. Harmful bacteria
B. Allergen
C. Living cell
D. Submicroscopic infectious agent
30: What is the scientific study of microorganisms called?
A. Microbiology
B. Biochemistry
C. Physics
D. Genetics
31: What is genetics?
A. The study of human anatomy
B. The study of genes, genetic variation and heredity in organisms
C. The study of plants and animals
D. The study of mathematical problems
32: What do Animal viruses infect?
A. Animals
B. Fungi
C. Bacteria
D. Plants
33: The arrow is indicating _____.
A. Anterior belly of the digastric
B. Posterior belly of the digastric
C. Stylohyoid
D. Sternothyroid
E. Thyrohyoid
34: The pointer is indicating the virus's _____.
A. Envelope -
B. Genome -
C. Mitochondria -
D. Capsid -
E. Microfilaments.
35: The ________ of a virion determines the type of cell it enters.
A. Glycoproteins
B. Matrix proteins
C. Lipid molecules
D. Shape
E. Nucleic acid
36: All of the following types of viruses have envelopes except __________.
A. Flavivirus
B. Poxvirus
C. Herpesvirus
D. Retrovirus
E. Rhabdovirus
F. Picornovirus
37: Candidates for the original source of viral genomes include __________.
A. Transposons
B. Archaea
C. Plasmids and transposons
D. Plasmids
E. Plants
F. Bacteria
38: A ________ assay is most useful for determining the viability of a viral preparation.
A. Direct (electron microscopic) count
B. Hemagglutination
C. Plaque
D. PCR
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