Question 1

A viroid is

Accepted Answer

A)   A naked, infectious piece of RNA.
B)   A complete, infectious virus particle.
C)   A provirus.
D)   A capsid without a nucleic acid.
E)   None of the above.F) None of the above
G) All of the above

Question 2

A persistent infection is an infection in which

Accepted Answer

A)   The disease process occurs gradually over a long period.
B)   Host cells are transformed.
C)   The virus remains in equilibrium with the host without causing a disease.
D)   Host cells are gradually lysed.
E)   Viral replication is unusually slow.F) B) and E)
G) B) and C)

Question 3

Approximately how many virus particles could fit along a 1 millimeter line?

Accepted Answer

A)   20,000
B)   2,000,000
C)   2
D)   20
E)   200F) C) and E)
G) D) and E)

Question 4

Continuous cell lines differ from primary cell lines in that

Accepted Answer

A)   Continuous cell lines are derived from primary cell lines.
B)   Viruses can be grown in continuous cell lines.
C)   Continuous cell lines are from human embryos.
D)   Continuous cell lines always have to be reisolated from animal tissues.
E)   Continuous cell lines can be maintained through an indefinite number of generations.F) C) and E)
G) C) and D)

Question 5

Which of the following statements is not true?

Accepted Answer

A)   Prophage genes are represented by a repressor protein coded for by the prophage.
B)   A prophage is phage DNA inserted into a bacterial chromosome.
C)   A prophage may result in new properties of the host cell.
D)   The prophage makes the host cell immune to infection by other phages.
E)   A prophage can pop out of the chromosome.F) A) and E)
G) A) and D)

Question 6

Generally, in a DNA- containing virus infection, the host animal cell supplies all of the following
Except

Accepted Answer

A)   RNA polymerase.
B)   tRNA.
C)   DNA polymerase.
D)   Nucleotides.
E)   None of the above.F) A) and B)
G) All of the above

Question 7

Bacteriophages derive all of the following from the host cell except

Accepted Answer

A)   tRNA.
B)   Nucleotides.
C)   Lysozyme.
D)   Amino acids.
E)   None of the above.F) None of the above
G) B) and D)

Question 8

Figure 13.1
 
-In Figure 13.1, the structures illustrated are composed of

Accepted Answer

A)   RNA
B)   DNA
C)   Capsomeres
D)   Capsids
E)   DNA or RNAF) A) and B)
G) A) and C)

Question 9

Viruses that have reverse transcriptase are in the

Accepted Answer

A)   Bacteriophage families.
B)   Influenzavirus.
C)   Retroviridae and Picornaviridae.
D)   Herpesviridae and Retroviridae.
E)   Hepadnaviridae and Retroviridae.F) A) and E)
G) D) and E)

Question 10

Nontoxic strains of Vibrio cholerae can become toxic when they are in the human intestine with toxic strains of bacteria. This suggests that the toxin genes are acquired by

Accepted Answer

A)   Prions.
B)   Reverse transcriptase.
C)   Host enzymes.
D)   Transduction.
E)   None of the above.F) A) and E)
G) B) and E)

Question 11

Which one of the following steps does not occur during multiplication of a Rhabdovirus?

Accepted Answer

A)   Synthesis of DNA
B)   Synthesis of viral proteins
C)   Synthesis of - strands of RNA
D)   Synthesis of + strands of RNAE) B) and D)
F) A) and B)

Question 12

The following steps occur during multiplication of Retroviruses. What is the fourth step?

Accepted Answer

A)   Attachment
B)   Penetration
C)   Synthesis of + RNA
D)   Uncoating
E)   Synthesis of double- stranded DNAF) B) and C)
G) A) and B)

Question 13

Which of the following would be the first step in biosynthesis of a virus with a - strand of RNA?

Accepted Answer

A)   Synthesis of double- stranded RNA from an RNA template
B)   Transcription of mRNA from DNA
C)   Synthesis of DNA from an RNA template
D)   Synthesis of double- stranded RNA from a DNA template
E)   None of the aboveF) None of the above
G) A) and C)

Question 14

Which of the following is not true about viruses?

Accepted Answer

A)   Viruses contain DNA or RNA but never both.
B)   Viruses use the anabolic machinery of the cell.
C)   Viruses contain a protein coat.
D)   Viruses use their own catabolic enzymes.
E)   None of the above.F) B) and E)
G) B) and D)

Question 15

A clear area against a confluent "lawn" of bacteria is called a

Accepted Answer

A)   Plaque.
B)   Phage.
C)   Cell lysis.
D)   Pock.
E)   None of the above.F) B) and E)
G) B) and C)

Question 16

In which of the following ways do viruses differ from bacteria?

Accepted Answer

A)   Viruses are filterable.
B)   Viruses are obligate intracellular parasites.
C)   Viruses are not composed of cells.
D)   Viruses don't have any nucleic acid.
E)   All of the above.F) A) and D)
G) B) and D)

Question 17

Which one of the following steps does not occur during multiplication of a Picornavirus?

Accepted Answer

A)   Synthesis of viral proteins
B)   Synthesis of - strands of RNA
C)   Synthesis of + strands of RNA
D)   Synthesis of DNA
E)   None of the aboveF) B) and E)
G) None of the above

Question 18

Lysogeny can result in all of the following except

Accepted Answer

A)   Transduction of specific genes.
B)   Immunity to reinfection by the same phage.
C)   Immunity to reinfection by any phage.
D)   Acquisition of new characteristics by the host cell.
E)   None of the above.F) B) and C)
G) B) and D)

Question 19

Some viruses, such as Human Herpes Virus 1, infect a cell without causing symptoms; these are called

Accepted Answer

A)   Slow viruses.
B)   Lytic viruses.
C)   Phages.
D)   Latent viruses.
E)   Unconventional viruses.F) C) and E)
G) None of the above

Question 20

An example of a latent viral infection is

Accepted Answer

A)   Cold sores.
B)   Subacute sclerosing panencephalitis.
C)   Influenza.
D)   Smallpox.
E)   None of the above.F) A) and E)
G) C) and D)

Exam 13: Viruses, Viroids, and Prions

Which one of the following steps does not occur during multiplication of a Picornavirus?

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A clear area against a confluent "lawn" of bacteria is called a

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Lysogeny can result in all of the following except

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Which of the following statements is not true?

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A persistent infection is an infection in which

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Which of the following would be the first step in biosynthesis of a virus with a - strand of RNA?

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An example of a latent viral infection is

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Viruses that have reverse transcriptase are in the

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The following steps occur during multiplication of Retroviruses. What is the fourth step?

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Figure 13.1 -In Figure 13.1, the structures illustrated are composed of

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In which of the following ways do viruses differ from bacteria?

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Some viruses, such as Human Herpes Virus 1, infect a cell without causing symptoms; these are called

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Continuous cell lines differ from primary cell lines in that

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Which of the following is not true about viruses?

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A viroid is

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Approximately how many virus particles could fit along a 1 millimeter line?

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Bacteriophages derive all of the following from the host cell except

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Nontoxic strains of Vibrio cholerae can become toxic when they are in the human intestine with toxic strains of bacteria. This suggests that the toxin genes are acquired by

Correct AnswerverifiedShow Answer

Generally, in a DNA- containing virus infection, the host animal cell supplies all of the following Except

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Which one of the following steps does not occur during multiplication of a Rhabdovirus?

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