Question 1

What structures are used by bacteriophages to attach to host cell receptors?

Accepted Answer

A)  viral sheaths
B)  tail fibers
C)  nucleic acids
D)  capsid headsE) A) and B)
F) None of the above

Question 2

Freshly isolated animal tissue that is placed in a growth medium and allowed to produce a cell monolayer is referred to as a/n _____ cell culture.

Accepted Answer

A)  initial
B)  primary
C)  secondary
D)  continuous
E)  positiveF) B) and E)
G) C) and D)

Question 3

Viruses that infect bacteria are specifically called

Accepted Answer

A)  viroids.
B)  prions.
C)  bacteriophages.
D)  satellite viruses.E) A) and D)
F) All of the above

Question 4

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

Accepted Answer

A)  cytoplasm.
B)  nucleus.
C)  nucleolus.
D)  DNA.
E)  cell membrane.F) B) and E)
G) C) and D)

Question 5

Uncoating of viral nucleic acid

Accepted Answer

A)  does not occur in bacteriophage multiplication.
B)  involves enzymatic destruction of the capsid.
C)  occurs during penetration in the multiplication cycle.
D)  occurs before replication.
E)  All of the choices are correct.F) C) and D)
G) A) and D)

Question 6

Spikes are glycoproteins that can be found projecting from the viral capsid.

Accepted Answer

A) True 
 B)False

Question 7

The process of dissolving the envelope and capsid to release the viral nucleic acid is

Accepted Answer

A)  adsorption.
B)  penetration.
C)  uncoating.
D)  synthesis.
E)  assembly.F) D) and E)
G) All of the above

Question 8

Persistent viruses that can reactivate periodically are

Accepted Answer

A)  chronic latent viruses.
B)  oncoviruses.
C)  syncytia.
D)  inclusion bodies.
E)  cytopathic.F) A) and B)
G) A) and C)

Question 9

Viral capsids are made from subunits called

Accepted Answer

A)  envelopes.
B)  spikes.
C)  capsomeres.
D)  prophages.
E)  peptones.F) A) and D)
G) None of the above

Question 10

Oncogenic viruses include all the following except

Accepted Answer

A)  hepatitis B virus.
B)  measles virus.
C)  Papillomavirus.
D)  HTLV-I and HTLV-II viruses.
E)  Epstein-Barr virus.F) A) and B)
G) None of the above

Question 11

The primary purpose/s of viral cultivation is/are to

Accepted Answer

A)  isolate and identify viruses in clinical specimens.
B)  prepare viruses for vaccines.
C)  do detailed research on viral structure,lifestyle,genetics,and effects on host cells.
D)  perform wide-scale harvesting of viruses.
E)  All of the choices are correct.F) C) and E)
G) A) and D)

Question 12

What type of phage enters an inactive prophage stage?

Accepted Answer

A)  primary
B)  secondary
C)  temperate
D)  temporary
E)  transformedF) C) and E)
G) A) and B)

Question 13

How are viroids transmitted?

Accepted Answer

A)  respiratory secretions
B)  sex
C)  plant seeds
D)  blood productsE) C) and D)
F) A) and D)

Question 14

One of the principal viral capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a/n _____ capsid.

Accepted Answer

A)  spiked
B)  complex
C)  icosahedral
D)  helical
E)  buckeyballF) B) and D)
G) A) and D)

Question 15

Which of the following occurs during assembly?

Accepted Answer

A)  nucleocapsid is formed
B)  new viral nucleic acid is formed
C)  viral spikes insert in host cell membrane
D)  nucleocapsid is formed and viral spikes insert in host cell membrane
E)  the viral envelope and the host cell membrane fuseF) A) and B)
G) A) and C)

Question 16

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 the choices are correct.F) B) and D)
G) B) and C)

Question 17

In transduction,the viral genome

Accepted Answer

A)  initiates lysis of the host.
B)  includes DNA from the previous host.
C)  is replicated in the cytoplasm.
D)  is replicated in the nucleus.E) A) and B)
F) All of the above

Question 18

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 19

Viruses exhibit all the following except

Accepted Answer

A)  definite shape.
B)  metabolism.
C)  genes.
D)  ability to infect host cells.
E)  ultramicroscopic size.F) A) and D)
G) A) and E)

Question 20

Viruses are unable to multiply outside of a host cell.

Accepted Answer

A) True 
 B)False

Exam 6: An Introduction to the Viruses

When a virus enters a host cell,the viral genes redirect the genetic and metabolic activities of the host cell.

Correct AnswerverifiedShow Answer

What type of phage enters an inactive prophage stage?

Correct AnswerverifiedShow Answer

The primary purpose/s of viral cultivation is/are to

Correct AnswerverifiedShow Answer

Viruses exhibit all the following except

Correct AnswerverifiedShow Answer

The process of dissolving the envelope and capsid to release the viral nucleic acid is

Correct AnswerverifiedShow Answer

How are viroids transmitted?

Correct AnswerverifiedShow Answer

One of the principal viral capsid shapes is a 20-sided figure with 12 evenly spaced corners referred to as a/n _____ capsid.

Correct AnswerverifiedShow Answer

Spikes are glycoproteins that can be found projecting from the viral capsid.

Correct AnswerverifiedShow Answer

Uncoating of viral nucleic acid

Correct AnswerverifiedShow Answer

Viral capsids are made from subunits called

Correct AnswerverifiedShow Answer

Viruses that infect bacteria are specifically called

Correct AnswerverifiedShow Answer

Freshly isolated animal tissue that is placed in a growth medium and allowed to produce a cell monolayer is referred to as a/n _____ cell culture.

Correct AnswerverifiedShow Answer

In transduction,the viral genome

Correct AnswerverifiedShow Answer

Which of the following occurs during assembly?

Correct AnswerverifiedShow Answer

Oncogenic viruses include all the following except

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is a type of cytopathic effect?

Correct AnswerverifiedShow Answer

Viruses are unable to multiply outside of a host cell.

Correct AnswerverifiedShow Answer

What structures are used by bacteriophages to attach to host cell receptors?

Correct AnswerverifiedShow Answer

Persistent viruses that can reactivate periodically are

Correct AnswerverifiedShow Answer

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