Question 1

Which of these structures are used by bacteriophages to attach to host cell receptors?

Accepted Answer

A)  sheath
B)  tail fibers
C)  nucleic acid
D)  capsid headE) A) and B)
F) B) and C)

Question 2

All of the following pertain to virus envelopes except they

Accepted Answer

A)  are gained as a virus leaves the host cell membrane.
B)  are found primarily on animal viruses.
C)  contain special virus proteins.
D)  help the virus particle attach to host cells.
E)  are located between the capsid and nucleic acid.F) A) and E)
G) C) and D)

Question 3

Viral capsids are made from subunits called

Accepted Answer

A)  envelopes.
B)  spikes.
C)  capsomers.
D)  prophages.
E)  peplomers.F) A) and B)
G) All of the above

Question 4

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)  All of these choices are correct.F) B) and C)
G) B) and E)

Question 5

Creutzfeldt-Jakob 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) B) and E)
G) A) and C)

Question 6

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

Accepted Answer

A)  lysogeny.
B)  budding.
C)  plaques.
D)  cytopathic effects.
E)  pocks.F) A) and D)
G) C) and D)

Question 7

Which of the following is not associated with every virus?

Accepted Answer

A)  envelope
B)  capsomers
C)  capsid
D)  nucleic acid
E)  GenomeF) C) and E)
G) B) and D)

Question 8

Select the FALSE statement about viruses.

Accepted Answer

A)  Cellular life-forms most likely preceded the origin of viruses since viruses need host cells in which to develop and reproduce.
B)  Viruses are the most numerous microbes on Earth.
C)  Viruses have impacted the evolution of all other cellular life-forms including bacteria, achaeans, and eukaryotes.
D)  When viruses are treated in a way that prevents them from entering host cells and reproducing, they are said to be dead.E) B) and D)
F) None of the above

Question 9

No cases of variant Creutzfeldt-Jakob syndrome linked to eating infected cows have occurred in the United States.

Accepted Answer

A) True 
 B)False

Question 10

The Adeno-Associated Virus (AAV) and the Delta Agent are prions.

Accepted Answer

A) True 
 B)False

Question 11

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)  blood agarF) A) and E)
G) C) and D)

Question 12

In general, most DNA viruses multiply in the host cell's _____, while most RNA viruses multiply in the host cell's _____.

Accepted Answer

A)  nucleus; cytoplasm
B)  cytoplasm; cell membrane
C)  cell membrane; cytoplasm
D)  cytoplasm; nucleus
E)  nucleus; endoplasmic reticulumF) B) and E)
G) C) and E)

Question 13

When used in a description of viruses, the term replication includes

Accepted Answer

A)  the production of multiple copies of a virus by a host cell.
B)  the copying of the viral DNA in a DNA virus.
C)  the copying of the genomic RNA in an RNA virus.
D)  All of these choices are correct.E) A) and B)
F) None of the above

Question 14

Viruses with _____ sense RNA contain the correct message for translation, while viruses with _____ sense RNA must first be converted into a correct message.

Accepted Answer

The answer of Viruses with _____ sense RNA contain the...

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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

Question 17

Prophages can be activated into viral replication and enter the lytic cycle.

Accepted Answer

A) True 
 B)False

Question 18

Viruses are ultramicroscopic because they range in size from 2 mm to 450 mm.

Accepted Answer

A) True 
 B)False

Question 19

Viruses belong to which of the following Kingdoms?

Accepted Answer

A)  Protists
B)  Fungi
C)  Archaea
D)  Bacteria
E)  None of the choices are correct.F) C) and E)
G) D) and E)

Question 20

Discuss theories regarding the origins of viruses and make a case for whether viruses originated before cellular life-forms or after cellular life-forms.

Accepted Answer

The origins of viruses have been a topic...

Exam 6: An Introduction to Viruses

Which of the following is not associated with every virus?

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Satellite viruses are

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All of the following pertain to virus envelopes except they

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Viruses are ultramicroscopic because they range in size from 2 mm to 450 mm.

Correct AnswerverifiedShow Answer

When used in a description of viruses, the term replication includes

Correct AnswerverifiedShow Answer

Prophages can be activated into viral replication and enter the lytic cycle.

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Which of these structures are used by bacteriophages to attach to host cell receptors?

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The Adeno-Associated Virus (AAV) and the Delta Agent are prions.

Correct AnswerverifiedShow Answer

Creutzfeldt-Jakob disease is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Viruses with _____ sense RNA contain the correct message for translation, while viruses with _____ sense RNA must first be converted into a correct message.

Correct AnswerverifiedShow Answer

In general, most DNA viruses multiply in the host cell's _____, while most RNA viruses multiply in the host cell's _____.

Correct AnswerverifiedShow Answer

Discuss theories regarding the origins of viruses and make a case for whether viruses originated before cellular life-forms or after cellular life-forms.

Correct AnswerAnswered by ExamLex AIThe origins of viruses have been a topic...View AnswerShow Answer

Viruses belong to which of the following Kingdoms?

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

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Viral capsids are made from subunits called

Correct AnswerverifiedShow Answer

No cases of variant Creutzfeldt-Jakob syndrome linked to eating infected cows have occurred in the United States.

Correct AnswerverifiedShow Answer

Select the FALSE statement about viruses.

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Which of the following will not support viral cultivation?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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Viruses with _ sense RNA contain the correct message for translation, while viruses with _ sense RNA must first be converted into a correct message.

Correct Answer
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In general, most DNA viruses multiply in the host cell's _, while most RNA viruses multiply in the host cell's _.

Correct Answer
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The origins of viruses have been a topic...
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