Question 1

Infectious protein particles are called

Accepted Answer

A)  viroids.
B)  phages.
C)  prions.
D)  oncogenic viruses.
E)  spikes.F) None of the above
G) D) and E)

Question 2

Satellite viruses are

Accepted Answer

A)  also called viroids.
B)  dependent on other viruses for replication.
C)  the cause of spongiform encephalopathies.
D)  significant pathogens of plants.E) B) and D)
F) C) and D)

Question 3

Reverse transcriptase synthesizes

Accepted Answer

A)  a positive RNA strand from a negative RNA strand.
B)  a negative RNA strand from a positive RNA strand.
C)  viral RNA from DNA.
D)  viral DNA from RNA.E) A) and B)
F) All of the above

Question 4

A fully formed virus that can cause an infection in a host cell is called a virion.

Accepted Answer

A) True 
 B)False

Question 5

Helical and icosahedral are terms used to describe the shape of a viral

Accepted Answer

A)  spike.
B)  capsomere.
C)  envelope.
D)  capsid.
E)  core.F) D) and E)
G) A) and B)

Question 6

When a bacterium acquires a trait from its temperate phage,it is called

Accepted Answer

A)  transformation.
B)  lysogenic conversion.
C)  viral persistence.
D)  transcription.
E)  translation.F) A) and C)
G) B) and C)

Question 7

Infectious naked strands of RNA that affect plants are called

Accepted Answer

A)  viroids.
B)  phages.
C)  prions.
D)  oncogenic viruses.
E)  spikes.F) A) and B)
G) All of the above

Question 8

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)  All of the choices will support viral cultivation.F) A) and E)
G) All of the above

Question 9

The activation of a prophage is called

Accepted Answer

A)  activation.
B)  lysogeny.
C)  transformation.
D)  induction.
E)  adsorption.F) A) and B)
G) B) and D)

Question 10

Who developed a rabies vaccine after realizing the disease was caused by something smaller than a bacterium?

Accepted Answer

A)  Leewonhoek
B)  Koch
C)  Pasteur
D)  Cohn
E)  IvanovskiF) A) and E)
G) C) and D)

Question 11

Which of the following is not a characteristic of a transformed cell?

Accepted Answer

A)  viral nucleic acid integrated into host DNA
B)  decreased growth rate
C)  alterations in chromosomes
D)  changes in cell surface molecules
E)  capacity to divide indefinitelyF) A) and C)
G) C) and D)

Question 12

Creutzfeldt-Jacob disease is

Accepted Answer

A)  caused by a chronic latent virus.
B)  initiated by an oncogenic virus.
C)  caused by a viroid.
D)  a spongiform encephalopathy of humans.
E)  also called "mad cow disease."F) All of the above
G) A) and E)

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

The envelope of enveloped viruses

Accepted Answer

A)  is identical to the host plasma membrane.
B)  is only composed of host endomembrane.
C)  always includes spikes.
D)  is obtained by viral budding or exocytosis.
E)  makes the virus very susceptible to drug therapy.F) A) and B)
G) C) and D)

Question 15

Host cells of viruses include

Accepted Answer

A)  humans and other animals.
B)  plants and fungi.
C)  bacteria.
D)  protozoa and algae.
E)  All of the choices are correct.F) B) and E)
G) B) and D)

Question 16

Lysogeny refers to

Accepted Answer

A)  altering the host range of a virus.
B)  latent state of herpes infections.
C)  virion exiting host cell.
D)  viral genome inserting into bacterial host chromosome.E) C) and D)
F) B) and C)

Question 17

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) A) and B)
G) All of the above

Question 18

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 agents.F) None of the above
G) All of the above

Question 19

Viruses mutate and some have not been discovered.

Accepted Answer

A) True 
 B)False

Question 20

Cells grown in culture form a/n

Accepted Answer

A)  monolayer.
B)  bilayer.
C)  aggregate.
D)  plaque.E) A) and D)
F) None of the above

Exam 6: An Introduction to the Viruses

Cells grown in culture form a/n

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Which of the following is not a characteristic of a transformed cell?

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Host cells of viruses include

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Satellite viruses are

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The envelope of enveloped viruses

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Infectious naked strands of RNA that affect plants are called

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Infectious protein particles are called

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

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A fully formed virus that can cause an infection in a host cell is called a virion.

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Reverse transcriptase synthesizes

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The activation of a prophage is called

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Which of the following represents a virus family name?

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Creutzfeldt-Jacob disease is

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Who developed a rabies vaccine after realizing the disease was caused by something smaller than a bacterium?

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Which of the following will not support viral cultivation?

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When a bacterium acquires a trait from its temperate phage,it is called

Correct AnswerverifiedShow Answer

Viruses mutate and some have not been discovered.

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Lysogeny refers to

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Helical and icosahedral are terms used to describe the shape of a viral

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