Question 1

The stage of viral replication in which the host cell produces viral nucleic acids and proteins is:

Accepted Answer

A)  Release
B)  Attachment
C)  Synthesis
D)  Penetration
E)  AssemblyF) B) and E)
G) A) and E)

Question 2

The influenza viruses that infect man usually are derived from a type that could also infect:

Accepted Answer

A)  Horses and sheep
B)  Cattle and water buffalo
C)  Chimpanzees and gorillas
D)  Birds and pigs
E)  A variety of primatesF) A) and B)
G) B) and C)

Question 3

Viruses:

Accepted Answer

A)  Consist of only a single cell
B)  Are smaller than cells
C)  Consist of multiple cells
D)  Contain a nucleus
E)  Contain ribosomesF) All of the above
G) A) and C)

Question 4

What is the genetic material found in HIV?

Accepted Answer

A)  Protein
B)  RNA
C)  DNA
D)  Lipid
E)  CarbohydrateF) C) and E)
G) A) and B)

Question 5

Human Papilloma Virus (HPV) can be transmitted sexually,and causes genital warts and cervical cancer.Why might a virus trigger increased cell growth?

Accepted Answer

A)  To use the cell's mitochondria to perform respiration
B)  Viruses are parasites and can only grow on dead cells
C)  To protect the virus from the immune system
D)  To allow the virus to spread to other people
E)  To use the cell's replication machinery to make more virusF) None of the above
G) C) and E)

Question 6

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years,and when a patient becomes stressed,the virus is released,forming cold sores on the lips.Where will the virus be while dormant in the nerve cell?

Accepted Answer

A)  Floating in the nerve cell cytoplasm
B)  Integrated in the nerve cell chromosomes
C)  In the nerve cell membrane
D)  Floating outside of the nerve cell, waiting to reinfect it
E)  In the bloodF) C) and E)
G) B) and E)

Question 7

The type of viral infection in which a virus enters a host cell and then remains dormant (hidden) in a host cell's chromosome is:

Accepted Answer

A)  A rare form of viral infection
B)  A transgenic infection
C)  A lytic infection
D)  A systematic infection
E)  A lysogenic infectionF) A) and B)
G) A) and D)

Question 8

Viruses always lack which of the following?

Accepted Answer

A)  A plasma membrane
B)  Genetic material
C)  A protein coat
D)  OrganellesE) B) and C)
F) None of the above

Question 9

Most scientific evidence points to the HIV viruses originating in Africa.

Accepted Answer

A) True 
 B)False

Question 10

figure 15.4 
-Reviewing figure 15.4,why could researchers use PCR to amplify viral DNA from the chimp Marilyn's tissues?

Accepted Answer

A)  Because the HIV is converted to DNA and integrated into a cell's chromosome
B)  Because PCR uses a reverse transcriptase and can thus detect RNA
C)  Because HIV uses DNA as its genetic material
D)  Because some of the HIV will be stuck to the outside of a cell
E)  Because PCR can amplify any genetic materialF) A) and B)
G) C) and E)

Question 11

A patient receiving a protease inhibitor and AZT is probably being treated for an infection by:

Accepted Answer

A)  A bacterium
B)  A protozoan
C)  A DNA virus
D)  A retrovirus
E)  A fungusF) D) and E)
G) B) and D)

Question 12

Most viruses:

Accepted Answer

A)  Infect only a few closely related species
B)  Only infect animal cells
C)  Infect a wide variety of organisms
D)  Cannot infect living cells
E)  Only infect plant cellsF) A) and C)
G) A) and B)

Question 13

The stage of viral replication in which the virus binds a cell surface receptor is:

Accepted Answer

A)  Release
B)  Penetration
C)  Synthesis
D)  Attachment
E)  AssemblyF) B) and C)
G) None of the above

Question 14

A layer of host cell membrane attached to a virus is called:

Accepted Answer

A)  An envelope
B)  A protein coat
C)  A capsomere
D)  A capsid
E)  A plasmidF) A) and D)
G) All of the above

Question 15

The vaccine against the influenza virus is prepared by treating the virus with detergent.How would this inactivate the virus?

Accepted Answer

A)  By destroying the envelope
B)  By destroying the protein coat
C)  By destroying the RNA
D)  By destroying the DNA
E)  By inhibiting viral assemblyF) None of the above
G) A) and C)

Question 16

Our most potent weapon in the fight against viruses is:

Accepted Answer

A)  Antibiotics
B)  Sulfa drugs
C)  Gene therapy
D)  Surgery
E)  VaccinationsF) A) and B)
G) C) and E)

Question 17

figure 15.4 
-Reviewing figure 15.4,which of the following is true of HIV?

Accepted Answer

A)  It contains DNA as its genetic material
B)  It replicates in the cytoplasm of cells
C)  It lyses cells when it is released
D)  It uses reverse transcriptase from the cell to make DNA
E)  It is an enveloped virusF) A) and E)
G) A) and B)

Question 18

Most antibiotics are not effective against viruses because these antibiotics do which of the following?

Accepted Answer

A)  Inhibit synthesis of cell walls
B)  Destroy DNA and RNA
C)  Inhibit all protein synthesis
D)  Target capsids
E)  Inhibit reverse transcriptaseF) C) and D)
G) None of the above

Question 19

Many doctors recommend that all women be vaccinated for HPV before they become sexually active.Which step in the viral life cycle would first be blocked by a vaccine?

Accepted Answer

A)  Attachment
B)  Penetration
C)  Synthesis
D)  Assembly
E)  ReleaseF) C) and D)
G) B) and C)

Question 20

figure 15.9 
-It has been difficult to generate drugs to treat AIDS for which reason?

Accepted Answer

A)  HIV does not cause AIDS
B)  HIV does not use any enzymes that can be targeted by drugs
C)  HIV mutates rapidly because reverse transcriptase lacks proofreading
D)  The only way to kill a virus is with a vaccine, not with drugs
E)  People with HIV infections die very rapidly, before the drugs have a chance to cure themF) A) and C)
G) A) and B)

Exam 15: Viruses

Many doctors recommend that all women be vaccinated for HPV before they become sexually active.Which step in the viral life cycle would first be blocked by a vaccine?

Correct AnswerverifiedShow Answer

Human Papilloma Virus (HPV) can be transmitted sexually,and causes genital warts and cervical cancer.Why might a virus trigger increased cell growth?

Correct AnswerverifiedShow Answer

The vaccine against the influenza virus is prepared by treating the virus with detergent.How would this inactivate the virus?

Correct AnswerverifiedShow Answer

figure 15.4 -Reviewing figure 15.4,which of the following is true of HIV?

Correct AnswerverifiedShow Answer

What is the genetic material found in HIV?

Correct AnswerverifiedShow Answer

Viruses:

Correct AnswerverifiedShow Answer

Our most potent weapon in the fight against viruses is:

Correct AnswerverifiedShow Answer

figure 15.4 -Reviewing figure 15.4,why could researchers use PCR to amplify viral DNA from the chimp Marilyn's tissues?

Correct AnswerverifiedShow Answer

Viruses always lack which of the following?

Correct AnswerverifiedShow Answer

The type of viral infection in which a virus enters a host cell and then remains dormant (hidden) in a host cell's chromosome is:

Correct AnswerverifiedShow Answer

figure 15.9 -It has been difficult to generate drugs to treat AIDS for which reason?

Correct AnswerverifiedShow Answer

Most scientific evidence points to the HIV viruses originating in Africa.

Correct AnswerverifiedShow Answer

Most antibiotics are not effective against viruses because these antibiotics do which of the following?

Correct AnswerverifiedShow Answer

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years,and when a patient becomes stressed,the virus is released,forming cold sores on the lips.Where will the virus be while dormant in the nerve cell?

Correct AnswerverifiedShow Answer

The stage of viral replication in which the host cell produces viral nucleic acids and proteins is:

Correct AnswerverifiedShow Answer

Most viruses:

Correct AnswerverifiedShow Answer

A patient receiving a protease inhibitor and AZT is probably being treated for an infection by:

Correct AnswerverifiedShow Answer

A layer of host cell membrane attached to a virus is called:

Correct AnswerverifiedShow Answer

The influenza viruses that infect man usually are derived from a type that could also infect:

Correct AnswerverifiedShow Answer

The stage of viral replication in which the virus binds a cell surface receptor is:

Correct AnswerverifiedShow Answer

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