Chapter 12: Viruses
MULTIPLE CHOICE
1. One positive use of viruses is their function as
a. infectious particles. c. cloning vectors.
b. pandemic initiators. d. marine predators.
ANS: C DIF: Easy REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Remembering
2. Which of the following facts supports the argument that viruses are living?
a. Viruses lack metabolism for energy and biosynthesis.
b. Viruses are capable of being crystallized.
c. Some living pathogenic bacteria contain degenerate genomes and rely significantly on a
host.
d. Viruses cannot replicate without a host.
ANS: C DIF: Moderate REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Understanding
3. Which of the following is NOT a possible effect of viral replication in the host cell?
a. death of the cell c. debilitation of the cell
b. differentiation of the cell d. alteration of the genome of the cell
ANS: B DIF: Moderate REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Understanding
4. ________ is an example of a virus that causes major economic losses in the agriculture industry.
a. Tobacco mosaic virus c. HIV
b. Measles virus d. Influenza
ANS: A DIF: Easy REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Remembering
5. West Nile virus is capable of infecting many different organisms (humans, birds, raccoons, and so on).
Based on this information, which of the following statements correctly describes West Nile virus?
a. West Nile virus has a narrow host range.
b. West Nile virus has a broad host range.
c. West Nile virus has a narrow tissue tropism.
d. West Nile virus is capable of fecal-oral transmission.
ANS: B DIF: Moderate REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Applying
, 6. Which of the following could possibly be an ancestor of the large asymmetrical DNA Vaccinia virus?
a. a degenerate single-celled organism c. influenza
b. a bacteriophage d. a cow
ANS: A DIF: Moderate REF: 12.1
OBJ: 12.1b Explain the function of the viral envelope and accessory proteins.
MSC: Applying
7. Which of the following is NOT caused by an aberrant protein?
a. Creutzfeldt-Jakob disease c. hepatitis
b. scrapie d. kuru
ANS: C DIF: Moderate REF: 12.2
OBJ: 12.2c Describe the nature of viroids and prions. MSC: Applying
8. Which of the following is NOT a level of viral evolution?
a. within an organelle c. within a viral species population
b. within a host community d. within an individual organism
ANS: A DIF: Moderate REF: 12.2
OBJ: 12.2b Explain why different viruses infect different hosts.
MSC: Understanding
9. Which of the following characteristics of the rabies virus is most important for its classification?
a. complex capsid morphology
b. single-stranded, negative sense RNA genome
c. presence of an envelope
d. narrow host range
ANS: B DIF: Moderate REF: 12.2
OBJ: 12.2b Explain why different viruses infect different hosts.
MSC: Applying
10. Examine the figure shown. Which viral classification group would be most NEGATIVELY affected by
antiviral reverse transcriptase inhibitors?
MULTIPLE CHOICE
1. One positive use of viruses is their function as
a. infectious particles. c. cloning vectors.
b. pandemic initiators. d. marine predators.
ANS: C DIF: Easy REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Remembering
2. Which of the following facts supports the argument that viruses are living?
a. Viruses lack metabolism for energy and biosynthesis.
b. Viruses are capable of being crystallized.
c. Some living pathogenic bacteria contain degenerate genomes and rely significantly on a
host.
d. Viruses cannot replicate without a host.
ANS: C DIF: Moderate REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Understanding
3. Which of the following is NOT a possible effect of viral replication in the host cell?
a. death of the cell c. debilitation of the cell
b. differentiation of the cell d. alteration of the genome of the cell
ANS: B DIF: Moderate REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Understanding
4. ________ is an example of a virus that causes major economic losses in the agriculture industry.
a. Tobacco mosaic virus c. HIV
b. Measles virus d. Influenza
ANS: A DIF: Easy REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Remembering
5. West Nile virus is capable of infecting many different organisms (humans, birds, raccoons, and so on).
Based on this information, which of the following statements correctly describes West Nile virus?
a. West Nile virus has a narrow host range.
b. West Nile virus has a broad host range.
c. West Nile virus has a narrow tissue tropism.
d. West Nile virus is capable of fecal-oral transmission.
ANS: B DIF: Moderate REF: 12.1
OBJ: 12.1a Describe diverse forms of the virion, or virus particle.
MSC: Applying
, 6. Which of the following could possibly be an ancestor of the large asymmetrical DNA Vaccinia virus?
a. a degenerate single-celled organism c. influenza
b. a bacteriophage d. a cow
ANS: A DIF: Moderate REF: 12.1
OBJ: 12.1b Explain the function of the viral envelope and accessory proteins.
MSC: Applying
7. Which of the following is NOT caused by an aberrant protein?
a. Creutzfeldt-Jakob disease c. hepatitis
b. scrapie d. kuru
ANS: C DIF: Moderate REF: 12.2
OBJ: 12.2c Describe the nature of viroids and prions. MSC: Applying
8. Which of the following is NOT a level of viral evolution?
a. within an organelle c. within a viral species population
b. within a host community d. within an individual organism
ANS: A DIF: Moderate REF: 12.2
OBJ: 12.2b Explain why different viruses infect different hosts.
MSC: Understanding
9. Which of the following characteristics of the rabies virus is most important for its classification?
a. complex capsid morphology
b. single-stranded, negative sense RNA genome
c. presence of an envelope
d. narrow host range
ANS: B DIF: Moderate REF: 12.2
OBJ: 12.2b Explain why different viruses infect different hosts.
MSC: Applying
10. Examine the figure shown. Which viral classification group would be most NEGATIVELY affected by
antiviral reverse transcriptase inhibitors?
