Question 1

All of the following are diseases caused by viruses except

Accepted Answer

A)  strep throat.
B)  AIDS.
C)  polio.
D)  small pox.
E)  measles.F) C) and E)
G) A) and B)

Question 2

Which of the following is a unique feature of viruses that separates them from bacteria?

Accepted Answer

A)  They are generally smaller.
B)  They are often highly toxic.
C)  They lack proteins.
D)  They have different nucleotides in their hereditary material.
E)  They cannot exist outside of a host cell.F) A) and B)
G) B) and C)

Question 3

Choose the letter of the best match from the following:
-Infectious protein.

Accepted Answer

A)  virion
B)  viroid
C)  virus
D)  prion
E)  phageF) D) and E)
G) None of the above

Question 4

Which of the following statements about the types and subtypes of the influenza (flu) virus is false?

Accepted Answer

A)  Of the three major types of flu virus (A,B,and 
C)  ,only Type A can occur in humans,other mammals,and birds.
B)  Flu subtype is determined by the kinds of proteins representing the H and N protein spikes making up the capsid of the virus.
C)  The A(H2N2) and the A(H3N2) strains of the virus require different vaccines.
D)  High mutation rates create more diversity in strains of flu than does genetic recombination.
E)  Genetic recombination between flu strains from different species is common.F) B) and E)
G) A) and E)

Question 5

Viruses that become established as stable parts of the host cell genome are called

Accepted Answer

A)  lethal.
B)  potent.
C)  temperate.
D)  virulent.
E)  latent.F) C) and D)
G) A) and E)

Question 6

The HIV virus is considered a(n) ______ virus,because after getting integrated into the host cell chromosomes,it does not begin replicating immediately.

Accepted Answer

A)  phage
B)  latent
C)  transforming
D)  benign
E)  inducibleF) B) and C)
G) C) and D)

Question 7

Mad cow disease is caused by a

Accepted Answer

A)  bacterium.
B)  virus.
C)  viroid.
D)  virion.
E)  prion.F) A) and E)
G) D) and E)

Question 8

The viruses that infect bacteria are called ____________.

Accepted Answer

The answer of The viruses that infect bacteria are called...

Question 9

Virulent viruses multiply within infected cells and eventually

Accepted Answer

A)  cause an alternation of generations in the host cell,releasing new viruses.
B)  cause the transformation of the host cell,releasing new viruses.
C)  cause lysis of the host cell,releasing new viruses.
D)  cause the transduction of the host cell,releasing new viruses.
E)  cause a transfer of material from the host cell,releasing new viruses.F) C) and E)
G) A) and B)

Question 10

HIV studies revealed that it is closely related to

Accepted Answer

A)  smallpox virus.
B)  ebola virus.
C)  herpes virus.
D)  a chimpanzee virus.
E)  mad cow diseasE.F) A) and D)
G) A) and E)

Question 11

While they are simple relative to cells,viruses often have a very diverse collection of components.Which one of the following choices is least likely to be found as part of a virus?

Accepted Answer

A)  proteins with functional binding sites
B)  membrane components
C)  single-stranded DNA
D)  ribosomes
E)  glycoproteinsF) A) and E)
G) C) and D)

Question 12

Viruses are characterized by all of the following except

Accepted Answer

A)  being found in every organism investigated so far.
B)  being specific to the hosts they infect.
C)  being capable of independent reproduction.
D)  having either a helical or isometric structure.
E)  being acellular.F) None of the above
G) D) and E)

Question 13

Which of the following statements about emerging viruses is false?

Accepted Answer

A)  Emerging viruses are able to "jump" from one species to another.
B)  Hantavirus,which causes a hemorrhagic-type fever,originates in deer mice.
C)  Ebola is an emerging virus of unknown origins that can have a mortality rate in excess of 50%.
D)  The emerging virus SARS is a completely new form of corona virus.
E)  The stable genome of the SARS virus makes it an unlikely candidate for vaccine development.F) D) and E)
G) A) and D)

Question 14

A scientist is investigating the lytic cycle of the T4 phage virus.This means she is examining the

Accepted Answer

A)  method used by the T4 phage to kill a bacterial cell.
B)  method used by the T4 phage to replicate proteins.
C)  method used by the T4 phage to replicate its DNA.
D)  method used by the T4 phage to enter a eukaryotic cell.
E)  method used by the T4 phage to begin protein synthesis on the bacterium's ribosomE.F) A) and B)
G) C) and D)

Question 15

Isometric viruses are _________ in basic structure,which contains 20 equilateral triangular surfaces.

Accepted Answer

The answer of Isometric viruses are _________ in basic structure,which...

Question 16

Which matching of HIV drug therapy and proposed mode of action is incorrect?

Accepted Answer

A)  AZT-blocks viral replication
B)  protease inhibitor-inhibitor of reverse transcriptase
C)  defective nef gene-incorporation into a vaccine
D)  chemokines-block HIV binding to CD4+ cells
E)  CAF-block viral replicationF) B) and D)
G) None of the above

Question 17

Viruses can ________ only after they have entered a host cell,and only by using the host's cellular machinery.

Accepted Answer

The answer of Viruses can ________ only after they have...

Question 18

If a virus enters the lytic phase in a host's cell,it will cause

Accepted Answer

A)  the host cell to reject the virus.
B)  the host cell to shrink because of the loss of cytoplasm that has been used in the synthesis of viral DNA.
C)  the host cell to burst because there will be so many viral particles present.
D)  the host cell to replicate itself at a higher than normal frequency.
E)  the host cell to initiate an attack on the virus.F) C) and E)
G) None of the above

Question 19

HIV infects cells by recognizing the cell-surface markers with its own

Accepted Answer

A)  DNA.
B)  glycoproteins.
C)  reverse transcriptase.
D)  capsid protein.
E)  enzymes.F) B) and E)
G) A) and B)

Question 20

Which of the following would not be a component of a newly produced HIV virus?

Accepted Answer

A)  protein capsid
B)  RNA
C)  reverse transcriptase
D)  viral envelope
E)  complementary DNAF) A) and E)
G) C) and E)

Exam 27: Viruses

Virulent viruses multiply within infected cells and eventually

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Mad cow disease is caused by a

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Which of the following statements about emerging viruses is false?

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Viruses that become established as stable parts of the host cell genome are called

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Which of the following would not be a component of a newly produced HIV virus?

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The HIV virus is considered a(n) ______ virus,because after getting integrated into the host cell chromosomes,it does not begin replicating immediately.

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Which of the following statements about the types and subtypes of the influenza (flu) virus is false?

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Isometric viruses are _________ in basic structure,which contains 20 equilateral triangular surfaces.

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If a virus enters the lytic phase in a host's cell,it will cause

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Which matching of HIV drug therapy and proposed mode of action is incorrect?

Correct AnswerverifiedShow Answer

A scientist is investigating the lytic cycle of the T4 phage virus.This means she is examining the

Correct AnswerverifiedShow Answer

While they are simple relative to cells,viruses often have a very diverse collection of components.Which one of the following choices is least likely to be found as part of a virus?

Correct AnswerverifiedShow Answer

Viruses can ________ only after they have entered a host cell,and only by using the host's cellular machinery.

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Choose the letter of the best match from the following: -Infectious protein.

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All of the following are diseases caused by viruses except

Correct AnswerverifiedShow Answer

HIV infects cells by recognizing the cell-surface markers with its own

Correct AnswerverifiedShow Answer

HIV studies revealed that it is closely related to

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The viruses that infect bacteria are called ____________.

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Viruses are characterized by all of the following except

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Which of the following is a unique feature of viruses that separates them from bacteria?

Correct AnswerverifiedShow Answer

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