Question 1

Infectious protein particles are called

Accepted Answer

A)  viroids.
B)  phages.
C)  prions.
D)  oncogenic viruses.
E)  spikes.

Question 2

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)  Ivanovski

Question 3

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.

Question 4

Infectious naked strands of RNA that affect plants are called

Accepted Answer

A)  viroids.
B)  phages.
C)  prions.
D)  oncogenic viruses.
E)  spikes.

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 agents.

Question 6

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."

Question 7

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.

Question 8

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.

Question 9

Viruses mutate and some have not been discovered.

Accepted Answer

A) True 
 B)False

Question 10

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.

Question 11

Cells grown in culture form a/n

Accepted Answer

A)  monolayer.
B)  bilayer.
C)  aggregate.
D)  plaque.

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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.

Question 15

The activation of a prophage is called

Accepted Answer

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

Question 16

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.

Question 17

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 indefinitely

Question 18

Which of the following represents a virus family name?

Accepted Answer

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

Question 19

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.

Question 20

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.

Exam 6: An Introduction to the Viruses

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following will not support viral cultivation?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Reverse transcriptase synthesizes

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The envelope of enveloped viruses

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Satellite viruses are

Correct AnswerverifiedShow Answer

Infectious protein particles are called

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The activation of a prophage is called

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

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Cells grown in culture form a/n

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Which of the following represents a virus family name?

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Host cells of viruses include

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Creutzfeldt-Jacob disease is

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Infectious naked strands of RNA that affect plants are called

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

Correct AnswerverifiedShow Answer

Lysogeny refers to

Correct AnswerverifiedShow Answer

Viruses mutate and some have not been discovered.

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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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