11/16/23, 2:47 PM Chapter 19 - Test bank for Campbell Biology, Cdn. Ed., 2e (Reece et al.)
Campbell Biology, Cdn. Ed., 2e (Reece et al.)
Chapter 19 Viruses
1) Which of the following viral features is most apt to correlate with the size of the genome?
A) size of the viral capsomeres
B) RNA versus DNA genome
C) double- versus single-strand genomes
D) size and shape of the capsid
E) glycoproteins of the envelope
Answer: D
Type: MC
Topic: Concept 19.1
Skill: Synthesis/Evaluation
2) Viral envelopes can best be analyzed with which of the following techniques?
A) transmission electron microscopy
B) antibodies against specific proteins not found in the host membranes
C) staining and visualization with the light microscope
D) use of plaque assays for quantitative measurement of viral titer
E) immunofluorescent tagging of capsid proteins
Answer: B
Type: MC
Topic: Concept 19.1
Skill: Synthesis/Evaluation
3) 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 enzymes produced by the virus before it infects the cell.
E) the proteins on its surface and that of the host.
Answer: E
Type: MC
Topic: Concept 19.1
Skill: Knowledge/Comprehension
4) Which of the following accounts for someone who has had a herpesvirus-mediated cold sore
or genital sore getting flare-ups for the rest of his or her life?
A) re-infection by a closely related herpesvirus of a different strain
B) re-infection by the same herpesvirus strain
C) co-infection with an unrelated virus that causes the same symptoms
D) copies of the herpesvirus genome permanently maintained in host nuclei
E) copies of the herpesvirus genome permanently maintained in host cell cytoplasm
Answer: D
Type: MC
Topic: Concept 19.2
Skill: Knowledge/Comprehension
1
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,11/16/23, 2:47 PM Chapter 19 - Test bank for Campbell Biology, Cdn. Ed., 2e (Reece et al.)
5) In many ways, the regulation of the genes of a particular group of viruses will be similar to the
regulation of the host genes. Therefore, which of the following would you expect of the genes of
the bacteriophage?
A) regulation via acetylation of histones
B) positive control mechanisms rather than negative
C) control of more than one gene in an operon
D) reliance on transcription activators
E) utilization of eukaryotic polymerases
Answer: C
Type: MC
Topic: Concept 19.2
Skill: Synthesis/Evaluation
6) Which of the following is characteristic of the lytic cycle?
A) Many bacterial cells containing viral DNA are produced.
B) Viral DNA is incorporated into the host genome.
C) The viral genome replicates without destroying the host.
D) A large number of phages are released at a time.
E) The virus-host relationship usually lasts for generations.
Answer: D
Type: MC
Topic: Concept 19.2
Skill: Knowledge/Comprehension
7) Which of the following statements describes the lysogenic cycle of lambda (λ) phage?
A) After infection, the viral genes immediately turn the host cell into a lambda-producing
factory, and the host cell then lyses.
B) Most of the prophage genes are activated by the product of a particular prophage gene.
C) The phage genome replicates along with the host genome.
D) Certain environmental triggers can cause the phage to exit the host genome, switching from
the lytic to the lysogenic.
E) The phage DNA is incorporated by crossing over into any nonspecific site on the host cell's
DNA.
Answer: C
Type: MC
Topic: Concept 19.2
Skill: Knowledge/Comprehension
2
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, 11/16/23, 2:47 PM Chapter 19 - Test bank for Campbell Biology, Cdn. Ed., 2e (Reece et al.)
8) Why do RNA viruses appear to have higher rates of mutation?
A) RNA nucleotides are more unstable than DNA nucleotides.
B) Replication of their genomes does not involve proofreading.
C) RNA viruses replicate faster.
D) RNA viruses can incorporate a variety of nonstandard bases.
E) RNA viruses are more sensitive to mutagens.
Answer: B
Type: MC
Topic: Concept 19.2
Skill: Knowledge/Comprehension
9) Most molecular biologists think that viruses originated from fragments of cellular nucleic
acid. Which of the following observations supports this theory?
A) Viruses contain either DNA or RNA.
B) Viruses are enclosed in protein capsids rather than plasma membranes.
C) Viruses can reproduce only inside host cells.
D) Viruses can infect both prokaryotic and eukaryotic cells.
E) Viral genomes are usually similar to the genome of the host cell.
Answer: E
Type: MC
Topic: Concept 19.2
Skill: Synthesis/Evaluation
10) A researcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco
mosaic virus (TMV). The cell contents are left in a covered test tube overnight. The next day this
mixture is sprayed on tobacco plants. Which of the following would be expected to occur?
A) The plants would develop some but not all of the symptoms of the TMV infection.
B) The plants would develop symptoms typically produced by viroids.
C) The plants would develop the typical symptoms of TMV infection.
D) The plants would not show any disease symptoms.
E) The plants would become infected, but the sap from these plants would be unable to infect
other plants.
Answer: C
Type: MC
Topic: Concept 19.3
Skill: Application/Analysis
11) Which viruses have single-stranded RNA that acts as a template for DNA synthesis?
A) lytic phages
B) proviruses
C) viroids
D) bacteriophages
E) retroviruses
Answer: E
Type: MC
Topic: Concept 19.3
Skill: Knowledge/Comprehension
3
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Campbell Biology, Cdn. Ed., 2e (Reece et al.)
Chapter 19 Viruses
1) Which of the following viral features is most apt to correlate with the size of the genome?
A) size of the viral capsomeres
B) RNA versus DNA genome
C) double- versus single-strand genomes
D) size and shape of the capsid
E) glycoproteins of the envelope
Answer: D
Type: MC
Topic: Concept 19.1
Skill: Synthesis/Evaluation
2) Viral envelopes can best be analyzed with which of the following techniques?
A) transmission electron microscopy
B) antibodies against specific proteins not found in the host membranes
C) staining and visualization with the light microscope
D) use of plaque assays for quantitative measurement of viral titer
E) immunofluorescent tagging of capsid proteins
Answer: B
Type: MC
Topic: Concept 19.1
Skill: Synthesis/Evaluation
3) 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 enzymes produced by the virus before it infects the cell.
E) the proteins on its surface and that of the host.
Answer: E
Type: MC
Topic: Concept 19.1
Skill: Knowledge/Comprehension
4) Which of the following accounts for someone who has had a herpesvirus-mediated cold sore
or genital sore getting flare-ups for the rest of his or her life?
A) re-infection by a closely related herpesvirus of a different strain
B) re-infection by the same herpesvirus strain
C) co-infection with an unrelated virus that causes the same symptoms
D) copies of the herpesvirus genome permanently maintained in host nuclei
E) copies of the herpesvirus genome permanently maintained in host cell cytoplasm
Answer: D
Type: MC
Topic: Concept 19.2
Skill: Knowledge/Comprehension
1
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,11/16/23, 2:47 PM Chapter 19 - Test bank for Campbell Biology, Cdn. Ed., 2e (Reece et al.)
5) In many ways, the regulation of the genes of a particular group of viruses will be similar to the
regulation of the host genes. Therefore, which of the following would you expect of the genes of
the bacteriophage?
A) regulation via acetylation of histones
B) positive control mechanisms rather than negative
C) control of more than one gene in an operon
D) reliance on transcription activators
E) utilization of eukaryotic polymerases
Answer: C
Type: MC
Topic: Concept 19.2
Skill: Synthesis/Evaluation
6) Which of the following is characteristic of the lytic cycle?
A) Many bacterial cells containing viral DNA are produced.
B) Viral DNA is incorporated into the host genome.
C) The viral genome replicates without destroying the host.
D) A large number of phages are released at a time.
E) The virus-host relationship usually lasts for generations.
Answer: D
Type: MC
Topic: Concept 19.2
Skill: Knowledge/Comprehension
7) Which of the following statements describes the lysogenic cycle of lambda (λ) phage?
A) After infection, the viral genes immediately turn the host cell into a lambda-producing
factory, and the host cell then lyses.
B) Most of the prophage genes are activated by the product of a particular prophage gene.
C) The phage genome replicates along with the host genome.
D) Certain environmental triggers can cause the phage to exit the host genome, switching from
the lytic to the lysogenic.
E) The phage DNA is incorporated by crossing over into any nonspecific site on the host cell's
DNA.
Answer: C
Type: MC
Topic: Concept 19.2
Skill: Knowledge/Comprehension
2
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, 11/16/23, 2:47 PM Chapter 19 - Test bank for Campbell Biology, Cdn. Ed., 2e (Reece et al.)
8) Why do RNA viruses appear to have higher rates of mutation?
A) RNA nucleotides are more unstable than DNA nucleotides.
B) Replication of their genomes does not involve proofreading.
C) RNA viruses replicate faster.
D) RNA viruses can incorporate a variety of nonstandard bases.
E) RNA viruses are more sensitive to mutagens.
Answer: B
Type: MC
Topic: Concept 19.2
Skill: Knowledge/Comprehension
9) Most molecular biologists think that viruses originated from fragments of cellular nucleic
acid. Which of the following observations supports this theory?
A) Viruses contain either DNA or RNA.
B) Viruses are enclosed in protein capsids rather than plasma membranes.
C) Viruses can reproduce only inside host cells.
D) Viruses can infect both prokaryotic and eukaryotic cells.
E) Viral genomes are usually similar to the genome of the host cell.
Answer: E
Type: MC
Topic: Concept 19.2
Skill: Synthesis/Evaluation
10) A researcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco
mosaic virus (TMV). The cell contents are left in a covered test tube overnight. The next day this
mixture is sprayed on tobacco plants. Which of the following would be expected to occur?
A) The plants would develop some but not all of the symptoms of the TMV infection.
B) The plants would develop symptoms typically produced by viroids.
C) The plants would develop the typical symptoms of TMV infection.
D) The plants would not show any disease symptoms.
E) The plants would become infected, but the sap from these plants would be unable to infect
other plants.
Answer: C
Type: MC
Topic: Concept 19.3
Skill: Application/Analysis
11) Which viruses have single-stranded RNA that acts as a template for DNA synthesis?
A) lytic phages
B) proviruses
C) viroids
D) bacteriophages
E) retroviruses
Answer: E
Type: MC
Topic: Concept 19.3
Skill: Knowledge/Comprehension
3
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