Question 1

You are working in a laboratory that is studying a newly isolated virus. Your job is to culture the virus using in vitro methods. Upon observing your inoculated tissue culture specimen one day, you notice clumps of cells growing on top of the original monolayer of cells. Microscopic analysis of stained cells from the culture reveal an alteration in host cell membrane protein content and chromosomal structure. Based upon this information, you hypothesize that the virus you are studying is ______.

Accepted Answer

A)   a bacteriophage
B)   a prion
C)   a viroid
D)   an oncovirus
E)   a satellite virusF) C) and E)
G) A) and E)

Question 2

Viruses are simple, noncellular, lacking mRNA and ribosomes.

Accepted Answer

A) True 
 B)False

Question 3

Satellite viruses are _______.

Accepted Answer

A)   also called viroids
B)   dependent on other viruses for replication
C)   the cause of spongiform encephalopathies
D)   signi?cant pathogens of plantsE) B) and C)
F) All of the above

Question 4

Viruses are unable to multiply outside of a host cell.

Accepted Answer

A) True 
 B)False  True

Question 5

Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called ______.

Accepted Answer

A)   latent
B)   oncogenic
C)   prions
D)   viroids
E)   delta agentsF) None of the above
G) B) and D)

Question 6

What structures are used by bacteriophages to attach to host cell receptors?

Accepted Answer

A)   Viral sheaths
B)   Tail ﬁbers
C)   Nucleic acids
D)   Capsid headsE) A) and C)
F) All of the above

Question 7

Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called ______.

Accepted Answer

A)   patches
B)   buds
C)   plaques
D)   cytopathic effects
E)   pocksF) B) and D)
G) None of the above

Question 8

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

Accepted Answer

A)   embryo
B)   cell
C)   plaque
D)   bacteriophage
E)   eggF) D) and E)
G) A) and B) B

Question 9

T-even phages ______.

Accepted Answer

A)   include the poxviruses
B)   infect Escherichia coli cells
C)   enter host cells by engulfment
D)   have helical capsidsE) C) and D)
F) All of the above

Question 10

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

Accepted Answer

A)   cytoplasm
B)   nucleus
C)   nucleolus
D)   DNA
E)   cell membraneF) B) and C)
G) A) and C)

Question 11

The process of dissolving the envelope and capsid to release the viral nucleic acid is ______.

Accepted Answer

A)   adsorption
B)   penetration
C)   uncoating
D)   synthesis
E)   assemblyF) A) and B)
G) A) and C) C

Question 12

Viruses attach to their hosts via ______.

Accepted Answer

A)   host glycoproteins
B)   host phospholipids
C)   viral phospholipids
D)   viral ﬂagella
E)   carbohydrate attachments of the viral capsidF) A) and D)
G) A) and C)

Question 13

Successful anti-HIV drug therapies today work by blocking the action of viral reverse transcriptase. Select which step of virus multiplication that would be directly blocked by this mechanism.

Accepted Answer

A)   Adsorption
B)   Penetration
C)   Synthesis
D)   Assembly
E)   ReleaseF) C) and D)
G) None of the above

Question 14

In order to replicate within a host cell, a virus with a genome comprised of single-stranded positive- sense RNA _______.

Accepted Answer

A)   must use its genomic strand as a template to make copies of negative-sense RNA for packaging
B)   must use its genomic strand as a template to make copies of positive-sense RNA for packaging
C)   must ﬁrst use its genomic strand as a template to make a negative-sense RNA, which then serves as a template to synthesize positive-sense RNA for packaging
D)   must ﬁrst use its genomic strand as a template to make copies of DNA for packagingE) B) and D)
F) None of the above

Question 15

Viruses ______.

Accepted Answer

A)   cannot be seen in a light microscope
B)   are prokaryotic
C)   contain 70S ribosomes
D)   undergo binary ?ssionE) A) and B)
F) A) and C)

Question 16

All of the following pertain to virus envelopes except ________.

Accepted Answer

A)   gained as a virus leaves the host cell membrane
B)   gained as a virus leaves the nuclear membrane
C)   contain special virus proteins
D)   help the virus particle attach to host cells
E)   located between the capsid and nucleic acidF) B) and D)
G) A) and E)

Question 17

Viral spikes are inserted into the host cell membrane before budding or exocytosis.

Accepted Answer

A) True 
 B)False

Question 18

Viral nomenclature uses the same system as living organisms; a genus and speci?c epithet is designated for each virus.

Accepted Answer

A) True 
 B)False

Question 19

Viruses acquire envelopes around their nucleocapsids during ______.

Accepted Answer

A)   replication
B)   assembly
C)   adsorption
D)   release
E)   penetrationF) All of the above
G) B) and C)

Question 20

The envelope of enveloped viruses _______.

Accepted Answer

A)   is identical to the host plasma membrane
B)   is only composed of host endomembrane
C)   does not contain spikes
D)   is obtained by viral budding or exocytosis
E)   makes the virus very susceptible to drug therapyF) A) and E)
G) A) and D)

Exam 6: Viruses and Prions

Correct Answer
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Viruses are simple, noncellular, lacking mRNA and ribosomes.

Correct Answer
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Satellite viruses are _______.

Correct Answer
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Viruses are unable to multiply outside of a host cell.

Correct Answer
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True

Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called ______.

Correct Answer
verified

What structures are used by bacteriophages to attach to host cell receptors?

Correct Answer
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Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called ______.

Correct Answer
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A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

Correct Answer
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B

T-even phages ______.

Correct Answer
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During lysogeny, an inactive prophage state occurs when the viral DNA is inserted into the host ______.

Correct Answer
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The process of dissolving the envelope and capsid to release the viral nucleic acid is ______.

Correct Answer
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C

Viruses attach to their hosts via ______.

Correct Answer
verified

Successful anti-HIV drug therapies today work by blocking the action of viral reverse transcriptase. Select which step of virus multiplication that would be directly blocked by this mechanism.

Correct Answer
verified

In order to replicate within a host cell, a virus with a genome comprised of single-stranded positive- sense RNA _______.

Correct Answer
verified

Viruses ______.

Correct Answer
verified

All of the following pertain to virus envelopes except ________.

Correct Answer
verified

Viral spikes are inserted into the host cell membrane before budding or exocytosis.

Correct Answer
verified

Viral nomenclature uses the same system as living organisms; a genus and speci?c epithet is designated for each virus.

Correct Answer
verified

Viruses acquire envelopes around their nucleocapsids during ______.

Correct Answer
verified

The envelope of enveloped viruses _______.

Correct Answer
verified

Exam 6: Viruses and Prions

Correct AnswerverifiedShow Answer

Viruses are simple, noncellular, lacking mRNA and ribosomes.

Correct AnswerverifiedShow Answer

Satellite viruses are _______.

Correct AnswerverifiedShow Answer

Viruses are unable to multiply outside of a host cell.

Correct AnswerverifiedTrue

Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called ______.

Correct AnswerverifiedShow Answer

What structures are used by bacteriophages to attach to host cell receptors?

Correct AnswerverifiedShow Answer

Viral growth in bird embryos can cause discrete, opaque spots in the embryonic membranes called ______.

Correct AnswerverifiedShow Answer

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

Correct AnswerverifiedB

T-even phages ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The process of dissolving the envelope and capsid to release the viral nucleic acid is ______.

Correct AnswerverifiedC

Viruses attach to their hosts via ______.

Correct AnswerverifiedShow Answer

Successful anti-HIV drug therapies today work by blocking the action of viral reverse transcriptase. Select which step of virus multiplication that would be directly blocked by this mechanism.

Correct AnswerverifiedShow Answer

In order to replicate within a host cell, a virus with a genome comprised of single-stranded positive- sense RNA _______.

Correct AnswerverifiedShow Answer

Viruses ______.

Correct AnswerverifiedShow Answer

All of the following pertain to virus envelopes except ________.

Correct AnswerverifiedShow Answer

Viral spikes are inserted into the host cell membrane before budding or exocytosis.

Correct AnswerverifiedShow Answer

Viral nomenclature uses the same system as living organisms; a genus and speci?c epithet is designated for each virus.

Correct AnswerverifiedShow Answer

Viruses acquire envelopes around their nucleocapsids during ______.

Correct AnswerverifiedShow Answer

The envelope of enveloped viruses _______.

Correct AnswerverifiedShow Answer

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True

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B

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C

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