Question 1

Uncoating of viral nucleic acid

Accepted Answer

A)  does not occur in bacteriophage multiplication.
B)  involves enzymatic destruction of the capsid.
C)  releases viral nucleic acid into the cell.
D)  occurs before replication.
E)  All of the choices are correct.

Question 2

Oncoviruses include all the following except

Accepted Answer

A)  hepatitis B virus.
B)  measles virus.
C)  papillomavirus.
D)  HTLV I.
E)  Epstein-Barr virus.

Question 3

Reverse transcriptase synthesizes

Accepted Answer

A)  the positive RNA strand from a negative RNA strand.
B)  a negative RNA strand from a positive RNA strand.
C)  RNA from DNA.
D)  DNA from RNA.
E)  None of the choices is correct.

Question 4

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

Accepted Answer

A)  sheath
B)  tail fibers
C)  nucleic acid
D)  capsid head
E)  None of the choices is correct.

Question 5

Viral tissue specificities are called

Accepted Answer

A)  ranges.
B)  virions.
C)  receptacles.
D)  tropisms.
E)  uncoating.

Question 6

Virus capsids are made from subunits called

Accepted Answer

A)  envelopes.
B)  spikes.
C)  capsomeres.
D)  prophages.
E)  peplomers.

Question 7

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 8

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)  cytopathic effects.
E)  pocks.

Question 9

T-even phages

Accepted Answer

A)  include the poxviruses.
B)  infect Escherichia coli cells.
C)  enter host cells by engulfment.
D)  have helical capsids.
E)  All of the choices are correct.

Question 10

A naked virus only has a(n)

Accepted Answer

A)  capsid.
B)  capsomere.
C)  nucleocapsid.
D)  envelope.
E)  antigenic surface.

Question 11

Host range is limited by

Accepted Answer

A)  type of nucleic acid in the virus.
B)  age of the host cell.
C)  type of host cell receptors on cell membrane.
D)  size of the host cell.
E)  All of the choices are correct.

Question 12

All of the following pertain to virus envelopes except

Accepted Answer

A)  gained as a virus leaves the host cell membrane.
B)  are comprised primarily of lipids.
C)  contain special virus proteins.
D)  help the virus particle attach to host cells.
E)  are located between the capsid and nucleic acid.

Question 13

The activation of a prophage is called

Accepted Answer

A)  activation.
B)  lysogeny.
C)  transformation.
D)  induction.
E)  adsorption.

Question 14

Which of the following is not a characteristic of a transformed cell?

Accepted Answer

A)  viral nucleic acid integrated into host DNA
B)  decreased growth rate
C)  alterations in chromosomes
D)  changes in cell surface molecules
E)  capacity to divide indefinitely

Question 15

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 only 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.

Question 16

Persistent viruses that can reactivate periodically are

Accepted Answer

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

Question 17

The primary purpose of viral cultivation is

Accepted Answer

A)  to isolate and identify viruses in clinical specimens.
B)  to prepare viruses for vaccines.
C)  to do detailed research on viral structure,lifestyle,genetics,and effects on host cells.
D)  All of the choices are correct.

Question 18

Viruses

Accepted Answer

A)  cannot be seen in a light microscope.
B)  are prokaryotic.
C)  contain 70S ribosomes.
D)  undergo binary fission.
E)  All of the choices are correct.

Question 19

Lysogeny refers to

Accepted Answer

A)  altering the host range of a virus.
B)  latent state of herpes infections.
C)  virion exiting host cell.
D)  viral genome inserting into bacterial host chromosome.
E)  None of the choices is correct.

Question 20

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

A)  positive,negative
B)  negative,positive
C)  primary,secondary
D)  secondary,primary
E)  None of the choices is correct.

Exam 5: Viral Structure and Life Cycles

T-even phages

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Which of the following is not a characteristic of a transformed cell?

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

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Persistent viruses that can reactivate periodically are

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Uncoating of viral nucleic acid

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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.

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

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Viruses

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

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

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All of the following pertain to virus envelopes except

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Oncoviruses include all the following except

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Reverse transcriptase synthesizes

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A naked virus only has a(n)

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Lysogeny refers to

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Viral tissue specificities are called

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The primary purpose of viral cultivation is

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Host range is limited by

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Virus capsids are made from subunits called

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The activation of a prophage is 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.

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