Question 1

What tool or technique used by Ivanowski and Beijerinck while studying diseased tobacco plants enabled them to determine that the disease was caused by an agent significantly smaller than bacteria?

Accepted Answer

A)   scanning electron microscopy that enabled them to view the virus the tobacco mosaic virus
B)   transmission electron microscopy that allowed them to view the tobacco mosaic virus
C)   porcelain filters that trapped bacteria but allowed passage of the virus
D)   cell culture that enabled cultivation of the virusE) B) and C)
F) A) and B)

Question 2

Which type of virus is most likely to cause the immediate damage and destruction of an infected animal cell when it is released?

Accepted Answer

A)   enveloped virus
B)   RNA virus
C)   nonenveloped virus
D)   DNA virusE) A) and B)
F) None of the above

Question 3

Which of the following is correct about viruses?

Accepted Answer

A)   Most viruses cannot be seen with a light microscope.
B)   Viruses are prokaryotic.
C)   Viruses contain 70S ribosomes.
D)   Viruses undergo binary fission.
E)   Viruses can be grown on nutrient agar.F) B) and E)
G) A) and D)

Question 4

How do enveloped animal viruses exit their host?

Accepted Answer

A)   budding or exocytosis
B)   bursting the host cell
C)   rupturing the virus
D)   endocytosisE) A) and B)
F) A) and C) A

Question 5

During lysogeny, an inactive prophage state occurs when the viral DNA is inserted into the _________.

Accepted Answer

bacterial ...

Question 6

Viruses are ultramicroscopic because they range in size from 2 mm to 450 mm.

Accepted Answer

A) True 
 B)False

Question 7

Viruses that consist of only a nucleocapsid are considered

Accepted Answer

A)   simple viruses.
B)   complex viruses.
C)   naked viruses.
D)   viroids.
E)   incomplete viruses.F) A) and E)
G) All of the above

Question 8

Viral capsids are made from subunits called

Accepted Answer

A)   envelopes.
B)   spikes.
C)   capsomers.
D)   prophages.
E)   peplomers.F) None of the above
G) D) and E)

Question 9

Viruses belong to which of the following Kingdoms?

Accepted Answer

A)   Protists
B)   Fungi
C)   Archaea
D)   Bacteria
E)   None of the choices are correct.F) A) and D)
G) B) and C)

Question 10

The International Committee on Taxonomy of Viruses has determined that there are only three orders of viruses.

Accepted Answer

A) True 
 B)False  False

Question 11

Two noncellular agents, smaller than viruses, are the infectious proteins called _____, and the infectious RNA strands called _____.

Accepted Answer

prions; viroids

Question 12

The virus-induced, specific damage to the host cell that can be seen in a light microscope is called

Accepted Answer

A)   lysogeny.
B)   budding.
C)   plaques.
D)   cytopathic effect.
E)   pocks.F) B) and D)
G) C) and D)

Question 13

All of the following are characteristics of viruses except

Accepted Answer

A)   they can be crystallized.
B)   they often have a geometric capsid.
C)   they have a viscous fluid inside their capsids.
D)   they can cause fatal diseases.
E)   they can cause mild diseases.F) A) and C)
G) C) and D)

Question 14

Which of the following will not support viral cultivation?

Accepted Answer

A)   live lab animals
B)   embryonated bird eggs
C)   primary cell cultures
D)   continuous cell cultures
E)   blood agarF) A) and E)
G) A) and D)

Question 15

Uncoating of viral nucleic acid

Accepted Answer

A)   does not occur in bacteriophage multiplication.
B)   involves enzymatic destruction of the capsid.
C)   occurs during penetration in the multiplication cycle.
D)   occurs before replication.
E)   All of these choices are correct.F) A) and B)
G) C) and D)

Question 16

In general, most DNA viruses multiply in the host cell's _____, while most RNA viruses multiply in the host cell's _____.

Accepted Answer

A)   nucleus; cytopl
B)   cytopl; cell membrane
C)   cell membrane; cytopl
D)   cytopl; nucleus
E)   nucleus; endoplic reticulumF) D) and E)
G) B) and C)

Question 17

The core of every virus particle always contains

Accepted Answer

A)   DNA.
B)   capsomers.
C)   enzymes.
D)   DNA and RNA.
E)   either DNA or RNA.F) A) and B)
G) C) and E)

Question 18

Noneveloped viruses enter their animal host cell via an active process that requires the participation of the animal cell.

Accepted Answer

A) True 
 B)False

Question 19

The descriptive groupings of virus into categories such as icosahedral and helical are based on

Accepted Answer

A)   the type of nucleic acid.
B)   the shape of the nucleocapsid.
C)   the presence or absence of an envelope.
D)   the mechanism of entry into host cells.E) A) and D)
F) A) and C)

Question 20

Which of the following is not associated with every virus?

Accepted Answer

A)   envelope
B)   capsomers
C)   capsid
D)   nucleic acid
E)   GenomeF) C) and E)
G) A) and E)

Exam 6: An Introduction to Viruses

What tool or technique used by Ivanowski and Beijerinck while studying diseased tobacco plants enabled them to determine that the disease was caused by an agent significantly smaller than bacteria?

Correct AnswerverifiedShow Answer

Which type of virus is most likely to cause the immediate damage and destruction of an infected animal cell when it is released?

Correct AnswerverifiedShow Answer

Which of the following is correct about viruses?

Correct AnswerverifiedShow Answer

How do enveloped animal viruses exit their host?

Correct AnswerverifiedA

During lysogeny, an inactive prophage state occurs when the viral DNA is inserted into the _________.

Correct Answerverifiedbacterial ...View AnswerShow Answer

Viruses are ultramicroscopic because they range in size from 2 mm to 450 mm.

Correct AnswerverifiedShow Answer

Viruses that consist of only a nucleocapsid are considered

Correct AnswerverifiedShow Answer

Viral capsids are made from subunits called

Correct AnswerverifiedShow Answer

Viruses belong to which of the following Kingdoms?

Correct AnswerverifiedShow Answer

The International Committee on Taxonomy of Viruses has determined that there are only three orders of viruses.

Correct AnswerverifiedFalse

Two noncellular agents, smaller than viruses, are the infectious proteins called _____, and the infectious RNA strands called _____.

Correct Answerverifiedprions; viroids

The virus-induced, specific damage to the host cell that can be seen in a light microscope is called

Correct AnswerverifiedShow Answer

All of the following are characteristics of viruses except

Correct AnswerverifiedShow Answer

Which of the following will not support viral cultivation?

Correct AnswerverifiedShow Answer

Uncoating of viral nucleic acid

Correct AnswerverifiedShow Answer

In general, most DNA viruses multiply in the host cell's _____, while most RNA viruses multiply in the host cell's _____.

Correct AnswerverifiedShow Answer

The core of every virus particle always contains

Correct AnswerverifiedShow Answer

Noneveloped viruses enter their animal host cell via an active process that requires the participation of the animal cell.

Correct AnswerverifiedShow Answer

The descriptive groupings of virus into categories such as icosahedral and helical are based on

Correct AnswerverifiedShow Answer

Which of the following is not associated with every virus?

Correct AnswerverifiedShow Answer

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A

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bacterial ...
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False

Two noncellular agents, smaller than viruses, are the infectious proteins called _, and the infectious RNA strands called _.

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prions; viroids

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In general, most DNA viruses multiply in the host cell's _, while most RNA viruses multiply in the host cell's _.

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