Question 1

The protein coat surrounding the viral genome is called the

Accepted Answer

A)  capsule.
B)  capsid.
C)  matrix.
D)  envelope.E) None of the above
F) A) and B)

Question 2

Animal viruses have been cultivated in

Accepted Answer

A)  suitable host animals.
B)  embryonated eggs.
C)  tissue cultures (monolayers of animal cells) .
D)  All of the choices are correct.E) None of the above
F) C) and D)

Question 3

The production of cholera toxin by virulent strains of Vibrio cholera is dependent upon genes in a bacteriophage.This is an example of

Accepted Answer

A)  lysogenic conversion.
B)  induction.
C)  bacterial transformation.
D)  transduction.E) A) and D)
F) All of the above

Question 4

Virion size ranges from

Accepted Answer

A)  1-40 nm.
B)  10-400 nm.
C)  600-1,000 nm.
D)  1,000-10,000 nm.E) C) and D)
F) None of the above

Question 5

The most common capsid morphologies are icosahedral and helical.

Accepted Answer

A) True 
 B)False

Question 6

The function of the viral protein coat is to

Accepted Answer

A)  protect the viral genetic material.
B)  aid in the transfer of the viral genetic material between host cells.
C)  elicit the production of protective antibodies.
D)  protect the viral genetic material and aid in the transfer of the viral genetic material between host cells.E) None of the above
F) B) and D)

Question 7

A __________ genome exists as several separate,nonidentical molecules that may be packaged together or separately.

Accepted Answer

A)  diploid
B)  segmented
C)  polyploid
D)  fractionatedE) None of the above
F) C) and D)

Question 8

For a temperate phage to produce more phage,which of the following must happen?

Accepted Answer

A)  Lysogeny
B)  Induction
C)  Lysogenic conversion
D)  Prophage formationE) A) and B)
F) None of the above

Question 9

Creutzfeldt-Jacob disease is known to have been transmitted by surgical instruments and transplanted nerve tissue.

Accepted Answer

A) True 
 B)False

Question 10

Viral capsids are generally constructed without any outside aid once the subunits have been synthesized.This process is called

Accepted Answer

A)  facilitated assembly.
B)  self-assembly.
C)  spontaneous maturation.
D)  self-maturation.E) B) and C)
F) A) and D)

Question 11

Most enveloped viruses use the host __________ membrane as their envelope source.

Accepted Answer

A)  plasma
B)  nuclear
C)  mitochondrial
D)  none of theseE) B) and C)
F) A) and B)

Question 12

Enveloped viruses may enter their host cells by engulfment within coated vesicles (endocytosis).

Accepted Answer

A) True 
 B)False

Question 13

Adult T-cell leukemia is thought to be caused by

Accepted Answer

A)  herpesviruses.
B)  retroviruses.
C)  parvoviruses.
D)  picornaviruses.E) A) and B)
F) A) and C)

Question 14

Which of the following is/are necessary for the replication of a satellite virus?

Accepted Answer

A)  Host cell only
B)  Helper virus only
C)  Prion only
D)  Host cell and helper virusE) A) and D)
F) B) and D)

Question 15

Which is not true of viruses?

Accepted Answer

A)  They can exist in an intracellular or extracellular phase.
B)  They infect animal and plant cells only.
C)  They can be observed with an electron microscope.
D)  They are acellular.
E)  They replicate only inside host cells.F) A) and E)
G) All of the above

Question 16

Which of the following diseases is (are) caused by prions?

Accepted Answer

A)  Scrapie
B)  Mad cow disease
C)  Kuru and Creutzfeldt-Jakob Disease
D)  All of the choices are correct.E) None of the above
F) B) and D)

Question 17

Viruses in the extracellular state possess few,if any,active enzymes.

Accepted Answer

A) True 
 B)False

Question 18

The simplest viruses consist of

Accepted Answer

A)  RNA only.
B)  Protein only.
C)  RNA or DNA in a protein coat.
D)  RNA or DNA in a protein coat covered with lipid envelope.
E)  RNA,DNA and enzymes in a protein coat with a lipid envelope.F) B) and E)
G) A) and B)

Question 19

A complete virus particle is called a

Accepted Answer

A)  capsid.
B)  nucleocapsid.
C)  virion.
D)  cell.E) A) and C)
F) None of the above

Question 20

Some complex viruses have icosahedral symmetry in the head region and helical symmetry in the tail.Overall,these viruses are said to have __________ symmetry.

Accepted Answer

A)  bilateral
B)  binal
C)  complex
D)  none of theseE) None of the above
F) A) and D)

Exam 6: Viruses and Other Acellular Infectious Agents

Most enveloped viruses use the host __________ membrane as their envelope source.

Correct AnswerverifiedShow Answer

The function of the viral protein coat is to

Correct AnswerverifiedShow Answer

Creutzfeldt-Jacob disease is known to have been transmitted by surgical instruments and transplanted nerve tissue.

Correct AnswerverifiedShow Answer

Which is not true of viruses?

Correct AnswerverifiedShow Answer

Animal viruses have been cultivated in

Correct AnswerverifiedShow Answer

Which of the following is/are necessary for the replication of a satellite virus?

Correct AnswerverifiedShow Answer

For a temperate phage to produce more phage,which of the following must happen?

Correct AnswerverifiedShow Answer

The production of cholera toxin by virulent strains of Vibrio cholera is dependent upon genes in a bacteriophage.This is an example of

Correct AnswerverifiedShow Answer

Enveloped viruses may enter their host cells by engulfment within coated vesicles (endocytosis).

Correct AnswerverifiedShow Answer

Viral capsids are generally constructed without any outside aid once the subunits have been synthesized.This process is called

Correct AnswerverifiedShow Answer

Adult T-cell leukemia is thought to be caused by

Correct AnswerverifiedShow Answer

The protein coat surrounding the viral genome is called the

Correct AnswerverifiedShow Answer

A complete virus particle is called a

Correct AnswerverifiedShow Answer

A __________ genome exists as several separate,nonidentical molecules that may be packaged together or separately.

Correct AnswerverifiedShow Answer

Virion size ranges from

Correct AnswerverifiedShow Answer

The most common capsid morphologies are icosahedral and helical.

Correct AnswerverifiedShow Answer

Which of the following diseases is (are) caused by prions?

Correct AnswerverifiedShow Answer

The simplest viruses consist of

Correct AnswerverifiedShow Answer

Viruses in the extracellular state possess few,if any,active enzymes.

Correct AnswerverifiedShow Answer

Some complex viruses have icosahedral symmetry in the head region and helical symmetry in the tail.Overall,these viruses are said to have __________ symmetry.

Correct AnswerverifiedShow Answer

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