Question 1

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) A) and C)
G) A) and B)

Question 2

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) A) and E)
G) A) and D)

Question 3

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 D)

Question 4

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) All of the above
G) None of the above B

Question 5

Viruses are unable to multiply outside of a host cell.

Accepted Answer

A) True 
 B)False  True

Question 6

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) D) and E)
G) B) and C)

Question 7

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 D)
F) None of the above

Question 8

Viruses are simple, noncellular, lacking mRNA and ribosomes.

Accepted Answer

A) True 
 B)False

Question 9

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 10

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) None of the above
G) A) and E)

Question 11

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) A) and B)
F) None of the above

Question 12

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) D) and E)
G) B) and C)

Question 13

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) A) and D)
F) None of the above

Question 14

Viruses ______.

Accepted Answer

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

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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) B) and C)
G) A) and D) C

Question 17

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 D)
G) A) and B)

Question 18

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) D) and E)
G) C) and E)

Question 19

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) None of the above

Question 20

T-even phages ______.

Accepted Answer

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

Exam 6: Viruses and Prions

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

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

Viruses acquire envelopes around their nucleocapsids during ______.

Correct Answer
verified

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

Correct Answer
verified
B

Viruses are unable to multiply outside of a host cell.

Correct Answer
verified
True

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

Correct Answer
verified

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

Correct Answer
verified

Viruses are simple, noncellular, lacking mRNA and ribosomes.

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

The envelope of enveloped viruses _______.

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

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

Correct Answer
verified

Satellite viruses are _______.

Correct Answer
verified

Viruses ______.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
C

Correct Answer
verified

All of the following pertain to virus envelopes except ________.

Correct Answer
verified

Viruses attach to their hosts via ______.

Correct Answer
verified

T-even phages ______.

Correct Answer
verified

Exam 6: Viruses and Prions

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

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

Viruses acquire envelopes around their nucleocapsids during ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

Viruses are unable to multiply outside of a host cell.

Correct AnswerverifiedTrue

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Viruses are simple, noncellular, lacking mRNA and ribosomes.

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

The envelope of enveloped viruses _______.

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

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

Correct AnswerverifiedShow Answer

Satellite viruses are _______.

Correct AnswerverifiedShow Answer

Viruses ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Correct AnswerverifiedShow Answer

All of the following pertain to virus envelopes except ________.

Correct AnswerverifiedShow Answer

Viruses attach to their hosts via ______.

Correct AnswerverifiedShow Answer

T-even phages ______.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified
True

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified