Question 1

A negative RNA virus must first

Accepted Answer

A)  synthesize a DNA copy of its genome.
B)  synthesize a negative RNA copy of its genome.
C)  synthesize a positive RNA copy of its genome.
D)  transcribe reverse transcriptase.
E)  transcribe RNA polymerase.F) A) and B)
G) A) and D)

Question 2

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 D)
G) None of the above

Question 3

The adeno-associated virus (AAV) and the delta agent are prions.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following is incorrect about prophages?

Accepted Answer

A)  Present when the virus is in lysogeny
B)  Formed when viral DNA enters the bacterial chromosome
C)  Replicated with host DNA and passed on to progeny
D)  Cause lysis of host cells
E)  Occur when temperate phages enter host cellsF) C) and D)
G) A) and B)

Question 5

Diagnosis of viral infections sometimes involves analyzing the patient's blood for specific _____ that the immune system produces against the virus.

Accepted Answer

A)  glycoproteins
B)  antibodies
C)  complement proteins
D)  antigensE) B) and D)
F) All of the above

Question 6

The core of every virus particle always contains ______.

Accepted Answer

A)  DNA
B)  capsomeres
C)  enzymes
D)  DNA and RNA
E)  either DNA or RNAF) A) and E)
G) B) and E)

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) B) and D)
F) A) and D)

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

One of the principal viral capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a/an _____ capsid.

Accepted Answer

A)  spiked
B)  complex
C)  icosahedral
D)  helical
E)  buckeyballF) A) and D)
G) C) and D)

Question 10

What type of phage enters an inactive prophage stage?

Accepted Answer

A)  Primary
B)  Secondary
C)  Temperate
D)  Temporary
E)  TransformedF) A) and B)
G) None of the above

Question 11

Which of the following represents a virus family name?

Accepted Answer

A)  Herpes simplex virus
B)  Herpesviridae
C)  Picornavirus
D)  Enterovirus
E)  Hepatitis B virusF) C) and D)
G) A) and E)

Question 12

Each virus is classified into a genus based on its host, target tissue, and type of disease it causes.

Accepted Answer

A) True 
 B)False

Question 13

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

Question 14

How are viroids transmitted?

Accepted Answer

A)  Respiratory secretions
B)  Sex
C)  Plant seeds
D)  Blood productsE) A) and B)
F) C) and D)

Question 15

When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell.

Accepted Answer

A) True 
 B)False

Question 16

Viruses exhibit all the following except ______.

Accepted Answer

A)  definite shape
B)  metabolism
C)  genes
D)  ability to infect host cells
E)  ultramicroscopic sizeF) A) and B)
G) A) and C)

Question 17

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

Question 18

Viruses are unable to multiply outside of a host cell.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is not associated with every virus?

Accepted Answer

A)  Envelope
B)  Capsomeres
C)  Capsid
D)  Nucleic acid
E)  GenomeF) A) and B)
G) None of the above

Question 20

Animal viruses have the ability to attach to and enter almost any animal host cell.

Accepted Answer

A) True 
 B)False

Exam 6: An Introduction to the Viruses

Viruses are unable to multiply outside of a host cell.

Correct AnswerverifiedShow Answer

What type of phage enters an inactive prophage stage?

Correct AnswerverifiedShow Answer

Viruses exhibit all the following except ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Animal viruses have the ability to attach to and enter almost any animal host cell.

Correct AnswerverifiedShow Answer

The core of every virus particle always contains ______.

Correct AnswerverifiedShow Answer

Which of the following is not associated with every virus?

Correct AnswerverifiedShow Answer

Which of the following is incorrect about prophages?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How are viroids transmitted?

Correct AnswerverifiedShow Answer

Diagnosis of viral infections sometimes involves analyzing the patient's blood for specific _____ that the immune system produces against the virus.

Correct AnswerverifiedShow Answer

When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The adeno-associated virus (AAV) and the delta agent are prions.

Correct AnswerverifiedShow Answer

Each virus is classified into a genus based on its host, target tissue, and type of disease it causes.

Correct AnswerverifiedShow Answer

A negative RNA virus must first

Correct AnswerverifiedShow Answer

Which of the following represents a virus family name?

Correct AnswerverifiedShow Answer

One of the principal viral capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a/an _____ capsid.

Correct AnswerverifiedShow Answer

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