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AP Bio Virus Quiz 1617
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. The cells lining the respiratory tract of pigs have receptors for both avian and human influenza viruses. Based
on the model above, which of the following best describes the origin of the new strain of human influenza
virus?
a. The new viral strain inherited a mixture of genetic material from both avian influenza
virus and human influenza virus.
b. The new viral strain inherited RNA molecules from the avian influenza virus and
packaged them inside the human influenza virus membrane.
c. The new viral strain inherited a mutant DNA molecule from the pig respiratory tract cell.
d. The new viral strain inherited an RNA molecule that had recombined with a DNA
molecule from the pig respiratory tract cell.
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2. The host range of a virus is determined by
a. whether its nucleic acid is DNA or RNA.
b. the proteins in the host's cytoplasm.
c. the enzymes carried by the virus.
d. the proteins on its surface and that of the host.
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3. The figure above shows several steps in the process of bacteriophage transduction in bacteria. Which of the
following explains how genetic variation in a population results from this process?
a. Bacterial proteins transferred from the donor bacterium by the phage to the recipient
bacterium recombine with proteins in the recipient’s cytoplasm.
b. The recipient bacterium incorporates the transduced genetic material coding for viral
proteins into its chromosome and synthesizes the corresponding proteins.
c. The phage infection of the recipient bacterium and the introduction of DNA carried by the
phage cause increased random mutations of the bacterial chromosome.
d. DNA of the recipient bacterial chromosome undergoes recombination with DNA
introduced by the phage from the donor bacterium, leading to a change in the recipient’s
genetic makeup.
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4. Which of the following is characteristic of the lytic cycle?
a. Viral DNA is incorporated into the host genome.
b. A large number of phages are released at a time.
c. The virus-host relationship usually lasts for generations.
d. The viral genome replicates without destroying the host.
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5. Why do RNA viruses appear to have higher rates of mutation?
a. Replication of their genomes does not involve proofreading.
b. RNA nucleotides are more unstable than DNA nucleotides.
c. RNA viruses replicate faster.
d. RNA viruses are more sensitive to mutagens.
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6. Which of the following immune system cells is most severely depleted by HIV/AIDS?
a. Plasma B cells
c. Coder T cells
b. Helper T cells
d. Memory cells
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7. If you already knew that the infectious agent was either bacterial or viral, which treatment would
allow you to distinguish between these two possibilities?
a. I
b. II
c. III
d. IV
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8. Which viruses have single-stranded RNA that acts as a template for DNA synthesis?
a. lytic viruses
c. retroviruses
b. prophages
d. bacteriophages
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9. Which of the following can be effective in preventing the onset of viral infection in humans?
a. taking vitamins
c. taking antibiotics
b. getting vaccinated
d. applying antiseptics
____ 10. Anti-viral drugs that have become useful are usually associated with which of the following properties?
a. ability to remove all viruses from the infected host
b. prevention of the host from becoming infected
c. mutating receptor sites on the host cells
d. interference with viral replication
____ 11. A virus has an RNA strand as its genome and upon infection of a host cell it directly serves as mRNA. Which
of the following would you expect to be able to measure?
a. replication
c. translation
b. transcription
d. accumulation of new ribosomes
____ 12. In the figure above of viral replication, at the arrow marked II, what enzyme(s) are being utilized?
a. reverse transcriptase
c. viral particle DNA polymerase
b. host cell DNA polymerase
d. host cell RNA polymerase