Question 1

Successful anti-HIV drug therapies today work by blocking the action of viral reverse transcriptase.Select which step of virus multiplication that would be directly blocked by this mechanism:

Accepted Answer

A)  adsorption
B)  penetration
C)  synthesis
D)  assembly
E)  releaseF) A) and B)
G) C) and D) C

Question 2

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) A) and C)
F) C) and D)

Question 3

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.F) C) and D)
G) A) and B)

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

The correct sequence of events in viral multiplication is:

Accepted Answer

A)  penetration,uncoating,synthesis,adsorption,assembly,release
B)  uncoating,penetration,synthesis,assembly,absorption,release
C)  adsorption,penetration,uncoating,synthesis,assembly,release
D)  assembly,synthesis,uncoating,release,penetration,adsorption
E)  adsorption,release,synthesis,uncoating,assembly,penetrationF) A) and E)
G) None of the above

Question 6

Viral nucleic acid types include:

Accepted Answer

A)  double-stranded DNA
B)  single-stranded DNA
C)  double-stranded RNA
D)  single-stranded RNA
E)  All of the choices are correct.F) B) and D)
G) C) and E)

Question 7

Some animals can become infected with multiple influenza virus strains usually associated with other animals.Which statement below describes the result of these infections?

Accepted Answer

A)  A new novel strain of flu may be produced,for which the human population has no immunity.
B)  Major genetic variations in the flu viruses can be reproduced.
C)  The viral genomes within the host cells can become recombined.
D)  All of the above are possible outcomes.E) C) and D)
F) A) and C)

Question 8

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

Accepted Answer

A)  embryo
B)  cell
C)  plaque
D)  bacteriophage
E)  eggF) C) and D)
G) B) and E)

Question 9

The core of every virus particle always contains

Accepted Answer

A)  DNA.
B)  capsomeres.
C)  enzymes.
D)  DNA and RNA.
E)  either DNA or RNA.F) A) and B)
G) A) and C)

Question 10

Mammalian viruses capable of starting tumors are

Accepted Answer

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

Question 11

Viruses are used to produce vaccines for prevention of certain viral infections.

Accepted Answer

A) True 
 B)False

Question 12

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)  intermediate;primaryF) D) and E)
G) A) and C)

Question 13

Which of the following 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)  cause lysis of host cells
E)  occur when temperate phages enter host cellsF) A) and E)
G) A) and C)

Question 14

Which of the following is not associated with every virus?

Accepted Answer

A)  envelope
B)  capsomeres
C)  capsid
D)  nucleic acid
E)  genomeF) None of the above
G) A) and B)

Question 15

Select the statement that most accurately describes the action of antimicrobial drugs today.

Accepted Answer

A)  Antiviral drug treatment is more effective than vaccination against a viral disease.
B)  Effective antiviral drugs have a long history of development and use.
C)  Antiviral drugs often result in toxic side effects due to their inhibition of host cell activity.
D)  The development of antiviral drug resistance has not been observed,as compared to the high rate of antibiotic resistance seen today.E) None of the above
F) B) and C)

Question 16

Two noncellular agents,smaller than viruses,are infectious proteins called _____ and infectious RNA strands called _____.

Accepted Answer

A)  prions;capsomeres
B)  virions;prions
C)  viroids;phages
D)  prions;phages
E)  prions;viroidsF) A) and B)
G) None of the above

Question 17

Viruses acquire envelopes around their nucleocapsids during

Accepted Answer

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

Question 18

Viruses are not filterable.

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A)  patches.
B)  buds.
C)  plaques.
D)  cytopathic effects.
E)  pocks.F) C) and D)
G) B) and D) E

Question 20

Which of the following is not a typical capsid shape?

Accepted Answer

A)  tetrahedral
B)  complex
C)  helical
D)  icosahedron
E)  viroid.F) B) and C)
G) D) and E)

Exam 6: An Introduction to the Viruses

Successful anti-HIV drug therapies today work by blocking the action of viral reverse transcriptase.Select which step of virus multiplication that would be directly blocked by this mechanism:

Correct AnswerverifiedC

Host range is limited by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The correct sequence of events in viral multiplication is:

Correct AnswerverifiedShow Answer

Viral nucleic acid types include:

Correct AnswerverifiedShow Answer

Some animals can become infected with multiple influenza virus strains usually associated with other animals.Which statement below describes the result of these infections?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The core of every virus particle always contains

Correct AnswerverifiedShow Answer

Mammalian viruses capable of starting tumors are

Correct AnswerverifiedB

Viruses are used to produce vaccines for prevention of certain viral infections.

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

Which of the following is incorrect about prophages?

Correct AnswerverifiedShow Answer

Which of the following is not associated with every virus?

Correct AnswerverifiedShow Answer

Select the statement that most accurately describes the action of antimicrobial drugs today.

Correct AnswerverifiedShow Answer

Two noncellular agents,smaller than viruses,are infectious proteins called _____ and infectious RNA strands called _____.

Correct AnswerverifiedShow Answer

Viruses acquire envelopes around their nucleocapsids during

Correct AnswerverifiedShow Answer

Viruses are not filterable.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedE

Which of the following is not a typical capsid shape?

Correct AnswerverifiedShow Answer

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C

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B

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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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Two noncellular agents,smaller than viruses,are infectious proteins called _ and infectious RNA strands called _.

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E

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