Bio 151 Exam 2 Practice test
Questions And Answers
A
R
U
LA
C
O
D
, 1. Why are viruses referred to as obligate parasites?
A. They cannot reproduce outside of a host cell.
B. Viral DNA always inserts itself into host DNA.
C. They invariably kill any cell they infect.
D. They can incorporate nucleic acids from other viruses.
A
E. They must use enzymes encoded by the virus itself. - ANS A
2. What is the name given to viruses that are single-stranded RNA that acts as a template for
R
DNA synthesis?
A. retroviruses
B. proviruses
C. viroids
U
D. bacteriophages
E. lytic phages - ANS A
LA
3. Which of the following series best reflects what we know about how the flu virus moves
between species?
A. An avian flu virus undergoes several mutations and rearrangements such that it is able to be
transmitted to other birds and then to humans.
B. Birds act as a reservoir species for the virus.
C. A flu virus from a human epidemic or pandemic infects birds; the birds replicate the virus
C
differently and then pass it back to humans.
D. An influenza virus gains new sequences of DNA from another virus, such as a herpesvirus;
this enables it to be transmitted to a human host.
E. An animal such as a pig is infected with more than one virus, genetic recombination occurs,
O
the virus mutates and can be transmitted to humans. - ANS E
4. Which of the following can be effective in preventing viral infection in humans?
D
A. getting vaccinated
B. taking nucleoside analogs that inhibit transcription C. taking antibiotics
D. applying antiseptics
E. taking vitamins - ANS A
5. Which of the following characteristics, structures, or processes is common to both cells and
viruses?
A. metabolism
B. ribosomes
C. genetic material composed of nucleic acid
Questions And Answers
A
R
U
LA
C
O
D
, 1. Why are viruses referred to as obligate parasites?
A. They cannot reproduce outside of a host cell.
B. Viral DNA always inserts itself into host DNA.
C. They invariably kill any cell they infect.
D. They can incorporate nucleic acids from other viruses.
A
E. They must use enzymes encoded by the virus itself. - ANS A
2. What is the name given to viruses that are single-stranded RNA that acts as a template for
R
DNA synthesis?
A. retroviruses
B. proviruses
C. viroids
U
D. bacteriophages
E. lytic phages - ANS A
LA
3. Which of the following series best reflects what we know about how the flu virus moves
between species?
A. An avian flu virus undergoes several mutations and rearrangements such that it is able to be
transmitted to other birds and then to humans.
B. Birds act as a reservoir species for the virus.
C. A flu virus from a human epidemic or pandemic infects birds; the birds replicate the virus
C
differently and then pass it back to humans.
D. An influenza virus gains new sequences of DNA from another virus, such as a herpesvirus;
this enables it to be transmitted to a human host.
E. An animal such as a pig is infected with more than one virus, genetic recombination occurs,
O
the virus mutates and can be transmitted to humans. - ANS E
4. Which of the following can be effective in preventing viral infection in humans?
D
A. getting vaccinated
B. taking nucleoside analogs that inhibit transcription C. taking antibiotics
D. applying antiseptics
E. taking vitamins - ANS A
5. Which of the following characteristics, structures, or processes is common to both cells and
viruses?
A. metabolism
B. ribosomes
C. genetic material composed of nucleic acid
