Question 1

Viroids consist of only RNA molecules.

Accepted Answer

A) True 
 B)False

Question 2

Viral infections in plants are spread from cell to cell via plasmodesmata.

Accepted Answer

A) True 
 B)False

Question 3

Influenza is caused by a DNA virus.

Accepted Answer

A) True 
 B)False

Question 4

Viruses are too small to carry any enzymes of their own.

Accepted Answer

A) True 
 B)False  False

Question 5

Which term best describes the biological nature of a virus?

Accepted Answer

A)  lipid
B)  rapidly dividing tissue
C)  living cell
D)  infectious particleE) A) and D)
F) None of the above

Question 6

Who is credited with the discovery of prions as a new biological principle of infection?

Accepted Answer

A)  Carl Louis
B)  Stanley Brenner
C)  Stanley Prusiner
D)  Carl WoeseE) C) and D)
F) B) and C)

Question 7

Which equation best describes the composition of the simplest type of viral particle?

Accepted Answer

A)  nucleic acid + capsid + protein spikes
B)  nucleic acid + capsid
C)  nucleic acid only
D)  nucleic acid + envelopeE) A) and C)
F) A) and D) B

Question 8

Some viruses can cause cancer.

Accepted Answer

A) True 
 B)False

Question 9

What type of molecule are viroids composed of?

Accepted Answer

A)  protein
B)  DNA
C)  carbohydrate
D)  RNAE) A) and D)
F) None of the above D

Question 10

What adaptation helped the strain of influenza responsible for the pandemic of 1918 to be such an effective infectious agent?

Accepted Answer

A)  resistance to antibiotics
B)  airborne mode of transmission
C)  mutations in polymerase genes
D)  unique protein spikesE) All of the above
F) A) and B)

Question 11

What is the viral DNA that is integrated into a bacterial host chromosome called?

Accepted Answer

A)  a microphage
B)  a spike
C)  an endospore
D)  a prophageE) B) and C)
F) None of the above

Question 12

-In the figure, which virus is illustrated?

Accepted Answer

A)  human immunodeficiency virus
B)  tobacco mosaic virus
C)  herpesvirus
D)  bacteriophageE) A) and B)
F) B) and D)

Question 13

BSE is caused by an infections protein molecule.

Accepted Answer

A) True 
 B)False

Question 14

Why are viruses considered nonliving?

Accepted Answer

A)  because they lack a cell wall
B)  because they cannot reproduce outside a host cell
C)  because they lack a nucleus
D)  because they contain RNA as their genetic materialE) A) and B)
F) None of the above

Question 15

Why are viral infections so much more difficult to treat than bacterial infections?

Accepted Answer

Viruses do not respond to the same treat...

Question 16

-In the figure, which number identifies the head?

Accepted Answer

A)  5
B)  4
C)  2
D)  1E) B) and C)
F) A) and B)

Question 17

-In the figure, which number identifies the structure that binds to the host cell?

Accepted Answer

A)  6
B)  5
C)  4
D)  1E) B) and C)
F) All of the above

Question 18

Evidence suggests that viruses evolved only after the evolution of cells.

Accepted Answer

A) True 
 B)False

Question 19

-Which term best describes the shape of the virus in the figure?

Accepted Answer

A)  helical
B)  icosahedral
C)  enveloped
D)  complexE) A) and D)
F) None of the above

Question 20

What is the protein layer surrounding the viral genome called?

Accepted Answer

A)  a cell membrane
B)  a capsid
C)  an envelope
D)  a capsuleE) All of the above
F) C) and D)

Exam 23: Viruses, Viroids, and Prions: Infectious Biological Particles

Viroids consist of only RNA molecules.

Correct AnswerverifiedShow Answer

Viral infections in plants are spread from cell to cell via plasmodesmata.

Correct AnswerverifiedShow Answer

Influenza is caused by a DNA virus.

Correct AnswerverifiedShow Answer

Viruses are too small to carry any enzymes of their own.

Correct AnswerverifiedFalse

Which term best describes the biological nature of a virus?

Correct AnswerverifiedShow Answer

Who is credited with the discovery of prions as a new biological principle of infection?

Correct AnswerverifiedShow Answer

Which equation best describes the composition of the simplest type of viral particle?

Correct AnswerverifiedB

Some viruses can cause cancer.

Correct AnswerverifiedShow Answer

What type of molecule are viroids composed of?

Correct AnswerverifiedD

What adaptation helped the strain of influenza responsible for the pandemic of 1918 to be such an effective infectious agent?

Correct AnswerverifiedShow Answer

What is the viral DNA that is integrated into a bacterial host chromosome called?

Correct AnswerverifiedShow Answer

-In the figure, which virus is illustrated?

Correct AnswerverifiedShow Answer

BSE is caused by an infections protein molecule.

Correct AnswerverifiedShow Answer

Why are viruses considered nonliving?

Correct AnswerverifiedShow Answer

Why are viral infections so much more difficult to treat than bacterial infections?

Correct AnswerverifiedViruses do not respond to the same treat...View AnswerShow Answer

-In the figure, which number identifies the head?

Correct AnswerverifiedShow Answer

-In the figure, which number identifies the structure that binds to the host cell?

Correct AnswerverifiedShow Answer

Evidence suggests that viruses evolved only after the evolution of cells.

Correct AnswerverifiedShow Answer

-Which term best describes the shape of the virus in the figure?

Correct AnswerverifiedShow Answer

What is the protein layer surrounding the viral genome called?

Correct AnswerverifiedShow Answer

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False

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B

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D

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Viruses do not respond to the same treat...
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