Question 1

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 2

Explain what is meant by host range, what governs host range, and what is meant by tissue tropism.

Accepted Answer

Host range refers to the range of differ...

Question 3

Which of the following viral types enter animal cells via fusion with the animal cell membrane?

Accepted Answer

A)  enveloped viruses
B)  non enveloped viruses
C)  naked viruses
D)  All of these choices are correct.E) B) and D)
F) B) and C)

Question 4

Classification of viruses into families involves determining all the following characteristics except

Accepted Answer

A)  type of nucleic acid.
B)  type of capsid.
C)  presence of an envelope.
D)  biochemical reactions.
E)  nucleic acid strand number.F) B) and C)
G) A) and D)

Question 5

Viral cultivation is used for

Accepted Answer

A)  diagnosis of viral infections.
B)  preparation of vaccines.
C)  producing adequate numbers of viruses for research purposes.
D)  studying the viral life cycle within host cells.
E)  observing the effects of viral infection on host cells.F) All of these choices are correct.G) A) and D)
H) B) and E)

Question 6

Which of the following is correct about viruses?

Accepted Answer

A)  Most viruses cannot be seen with a light microscope.
B)  Viruses are prokaryotic.
C)  Viruses contain 70S ribosomes.
D)  Viruses undergo binary fission.
E)  Viruses can be grown on nutrient agar.F) A) and B)
G) All of the above

Question 7

The three basic groups of viruses based on morphology include

Accepted Answer

A)  enveloped viruses, non enveloped viruses, and complex viruses.
B)  enveloped viruses, DNA viruses, and non enveloped viruses.
C)  helical viruses, round viruses, and enveloped viruses.
D)  non enveloped viruses, RNA viruses, and bacteriophages.E) B) and C)
F) A) and D)

Question 8

Which 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)  always lyse the host cells
E)  occur when temperate phages enter host cellsF) B) and C)
G) None of the above

Question 9

The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is

Accepted Answer

A)  adsorption to the host cells.
B)  injection of the viral nucleic acid into the host cell.
C)  host cell synthesis of viral enzymes and capsid proteins.
D)  assembly of nucleocapsids.
E)  replication of viral nucleic acid.F) A) and D)
G) C) and E)

Question 10

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

Accepted Answer

The answer of A common method for cultivating viruses in...

Question 11

While of the following techniques or tools has provided information regarding the nature of viruses, which one had to be developed before the genetics, biochemistry, and life cycles of viruses could be thoroughly studied?

Accepted Answer

A)  scanning electron microscopy
B)  viral cultivation techniques
C)  transmission electron microscopy
D)  serological techniquesE) A) and B)
F) A) and D)

Question 12

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

Accepted Answer

The answer of Diagnosis of viral infections sometimes involves analyzing...

Question 13

Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called

Accepted Answer

A)  lysogeny.
B)  budding.
C)  plaques.
D)  pocks.E) A) and B)
F) None of the above

Question 14

Which of the following is a type of cytopathic effect?

Accepted Answer

A)  inclusions in the nucleus
B)  multinucleated giant cells
C)  inclusions in the cytoplasm
D)  rounding of cells
E)  All of these choices are correct.F) A) and B)
G) A) and C)

Question 15

How do enveloped animal viruses exit their host?

Accepted Answer

A)  budding or exocytosis
B)  bursting the host cell
C)  rupturing the virus
D)  endocytosisE) B) and C)
F) A) and B)

Question 16

The descriptive groupings of virus into categories such as icosahedral and helical are based on

Accepted Answer

A)  the type of nucleic acid.
B)  the shape of the nucleocapsid.
C)  the presence or absence of an envelope.
D)  the mechanism of entry into host cells.E) A) and B)
F) C) and D)

Question 17

Viruses acquire envelopes around their nucleocapsids during

Accepted Answer

A)  replication.
B)  assembly.
C)  adsorption.
D)  release.
E)  penetration.F) A) and E)
G) B) and C)

Question 18

Helical and icosahedral are terms used to describe the shapes of a virus

Accepted Answer

A)  spike.
B)  capsomere.
C)  envelope.
D)  capsid.
E)  core.F) All of the above
G) C) and D)

Question 19

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

Accepted Answer

bacterial ...

Question 20

All of the following are correct about treating viral diseases except

Accepted Answer

A)  viruses are killed by the same antibiotics that kill bacteria.
B)  many antiviral drugs block viral replication.
C)  many antiviral drugs cause severe side effects.
D)  interferons show potential for treating and preventing viral infections.
E)  All of these choices are correct.F) A) and B)
G) B) and D)

Exam 6: An Introduction to Viruses

How do enveloped animal viruses exit their host?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is correct about viruses?

Correct AnswerverifiedShow Answer

The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is

Correct AnswerverifiedShow Answer

Which of the following viral types enter animal cells via fusion with the animal cell membrane?

Correct AnswerverifiedShow Answer

The descriptive groupings of virus into categories such as icosahedral and helical are based on

Correct AnswerverifiedShow Answer

Viruses acquire envelopes around their nucleocapsids during

Correct AnswerverifiedShow Answer

Viral cultivation is used for

Correct AnswerverifiedShow Answer

Helical and icosahedral are terms used to describe the shapes of a virus

Correct AnswerverifiedShow Answer

Classification of viruses into families involves determining all the following characteristics except

Correct AnswerverifiedShow Answer

A common method for cultivating viruses in the lab is to use in vitro systems called _____ cultures.

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

The three basic groups of viruses based on morphology include

Correct AnswerverifiedShow Answer

Which is incorrect about prophages?

Correct AnswerverifiedShow Answer

All of the following are correct about treating viral diseases except

Correct AnswerverifiedShow Answer

Which of the following is a type of cytopathic effect?

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Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called

Correct AnswerverifiedShow Answer

Explain what is meant by host range, what governs host range, and what is meant by tissue tropism.

Correct AnswerAnswered by ExamLex AIHost range refers to the range of differ...View AnswerShow Answer

While of the following techniques or tools has provided information regarding the nature of viruses, which one had to be developed before the genetics, biochemistry, and life cycles of viruses could be thoroughly studied?

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

Correct Answerverifiedbacterial ...View AnswerShow Answer

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Host range refers to the range of differ...
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bacterial ...
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