Question 1

figure 15.4 
-SIV causes symptomless infections in monkeys and apes,yet causes AIDS-like disease in chimpanzees.HIV is closely related to SIV and causes AIDS in humans.Which of the following is the best explanation for these observations?

Accepted Answer

A)  Monkeys, apes, and chimpanzees are all genetically very similar
B)  The effects of viruses on different species is random
C)  Chimpanzees and humans have a more recent common ancestor
D)  SIV is most likely lytic in apes and monkeys
E)  SIV is most likely latent in chimpanzeesF) A) and E)
G) A) and C)

Question 2

The correct sequence of the stages of viral replication is:

Accepted Answer

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

Question 3

Viral DNA inserted into a chromosome of the host is:

Accepted Answer

A)  A carrier
B)  A phage
C)  A reservoir
D)  A prophage
E)  A lytic infectionF) A) and E)
G) C) and D)

Question 4

The stage of viral replication in which the new viruses leave the host cell is:

Accepted Answer

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

Question 5

figure 15.9 
-Based on figure 15.9,which of the following statements is most likely accurate?

Accepted Answer

A)  HIV arose more than once
B)  HIV groups M, N, and O will be more similar to each other than to SIV
C)  SIV only arose once
D)  The SIV strains will all have more sequence similarity with each other than with any of the HIV groups
E)  HIV and SIV are not genetically relatedF) C) and D)
G) A) and B)

Question 6

Rhinovirus is an RNA virus that causes the common cold and sinus infections.The virus does not contain an envelope.Which of the following is true of a rhinovirus?

Accepted Answer

A)  It does not contain protein or genetic material
B)  It does not contain genetic material
C)  It does not contain protein
D)  It does not contain lipid or protein
E)  It does not contain lipidF) D) and E)
G) A) and C)

Question 7

The stage of viral replication in which viral components are put together to form new viruses is:

Accepted Answer

A)  Release
B)  Assembly
C)  Attachment
D)  Penetration
E)  SynthesisF) A) and C)
G) C) and D)

Question 8

How did the researchers first know that Marilyn the chimp may be infected with HIV?

Accepted Answer

A)  Because she had HIV RNA in her blood
B)  Because she had HIV DNA in her tissues
C)  Because she had been used in HIV research
D)  Because she had raised antibodies against HIV
E)  Because she had symptoms of HIV infection, or AIDSF) A) and D)
G) C) and D)

Question 9

Viruses are not considered to be alive,yet they share this ability with living cells:

Accepted Answer

A)  They can metabolize food
B)  They can evolve
C)  They can reproduce on their own
D)  They can produce cell membranes
E)  They can synthesize proteinsF) A) and B)
G) A) and E)

Question 10

A capsid is:

Accepted Answer

A)  A lipid coat of a virus
B)  A viral DNA molecule
C)  A protein coat of a virus
D)  A viral RNA molecule
E)  The area in the virus where its genetic information is locatedF) A) and B)
G) B) and E)

Question 11

Rhinovirus is an RNA virus that causes the common cold and sinus infections.The virus does not contain an envelope.What would you predict to be the primary route of transmission of rhinovirus?

Accepted Answer

A)  Sexual contact
B)  Blood
C)  Aerosol
D)  Insects
E)  ParasitesF) A) and E)
G) A) and D)

Question 12

The shape of a virus is determined by:

Accepted Answer

A)  Its DNA
B)  Its RNA
C)  Its envelope
D)  Its host
E)  Its coat protein organizationF) None of the above
G) C) and E)

Question 13

Many viruses are inhibited by antibiotics.

Accepted Answer

A) True 
 B)False

Question 14

The enzyme that HIV uses to convert its RNA into DNA is:

Accepted Answer

A)  Reverse transcriptase
B)  DNA polymerase
C)  RNA polymerase
D)  RNA integrase
E)  TranscriptaseF) A) and E)
G) All of the above

Question 15

The treating of a viral infection by inoculating the host with a bacterial virus:

Accepted Answer

A)  Is chemotherapy
B)  Is phage therapy
C)  Is radiation therapy
D)  Is antibiotic therapy
E)  None of these are correctF) A) and E)
G) C) and D)

Question 16

The influenza virus contains an RNA genome.Every year the common flu vaccine is designed to protect against three different strains of the influenza virus.Why do scientists typically have to make a new vaccine every year?

Accepted Answer

A)  Because our bodies develop resistance to the vaccine and it becomes less effective
B)  Because the virus develops resistance to the vaccine
C)  Because the virus can mutate into new strains
D)  Because people change their habits each year and become susceptible to different strains of the virus
E)  Because the common influenza virus can come from many species of animals including cats and dogsF) None of the above
G) D) and E)

Question 17

A vaccine against the influenza virus would result in production of antibodies against which of the following?

Accepted Answer

A)  The protein coat
B)  Viral RNA
C)  Viral DNA
D)  Proteins in the envelope
E)  Lipids in the envelopeF) B) and C)
G) D) and E)

Question 18

-Given the structure of the anti-HIV drug azidothymidine (AZT) ,how do you think it blocks viral replication?

Accepted Answer

A)  It blocks RNA synthesis
B)  It inhibits host T cells from replicating
C)  It inhibits the assembly of new viruses in the cell
D)  It blocks DNA synthesis
E)  It prevents HIV from entering the cellF) B) and D)
G) None of the above

Question 19

Which of the following diseases is NOT caused by viruses?

Accepted Answer

A)  The common cold and influenza
B)  Smallpox and mononucleosis
C)  Polio and rabies
D)  Aids and warts
E)  DiabetesF) B) and E)
G) A) and B)

Question 20

Poliomyelitis is an RNA virus that can invade the nervous system and cause paralysis within a matter of hours.Polio has been virtually eliminated world-wide by which of the following?

Accepted Answer

A)  Antibiotics
B)  Vaccination
C)  Mosquito control
D)  Quarantine
E)  Improve water qualityF) None of the above
G) A) and B)

Exam 15: Viruses

-Given the structure of the anti-HIV drug azidothymidine (AZT) ,how do you think it blocks viral replication?

Correct AnswerverifiedShow Answer

figure 15.4 -SIV causes symptomless infections in monkeys and apes,yet causes AIDS-like disease in chimpanzees.HIV is closely related to SIV and causes AIDS in humans.Which of the following is the best explanation for these observations?

Correct AnswerverifiedShow Answer

Which of the following diseases is NOT caused by viruses?

Correct AnswerverifiedShow Answer

How did the researchers first know that Marilyn the chimp may be infected with HIV?

Correct AnswerverifiedShow Answer

The influenza virus contains an RNA genome.Every year the common flu vaccine is designed to protect against three different strains of the influenza virus.Why do scientists typically have to make a new vaccine every year?

Correct AnswerverifiedShow Answer

The stage of viral replication in which viral components are put together to form new viruses is:

Correct AnswerverifiedShow Answer

Rhinovirus is an RNA virus that causes the common cold and sinus infections.The virus does not contain an envelope.Which of the following is true of a rhinovirus?

Correct AnswerverifiedShow Answer

The treating of a viral infection by inoculating the host with a bacterial virus:

Correct AnswerverifiedShow Answer

Many viruses are inhibited by antibiotics.

Correct AnswerverifiedShow Answer

The correct sequence of the stages of viral replication is:

Correct AnswerverifiedShow Answer

The stage of viral replication in which the new viruses leave the host cell is:

Correct AnswerverifiedShow Answer

Rhinovirus is an RNA virus that causes the common cold and sinus infections.The virus does not contain an envelope.What would you predict to be the primary route of transmission of rhinovirus?

Correct AnswerverifiedShow Answer

A vaccine against the influenza virus would result in production of antibodies against which of the following?

Correct AnswerverifiedShow Answer

figure 15.9 -Based on figure 15.9,which of the following statements is most likely accurate?

Correct AnswerverifiedShow Answer

A capsid is:

Correct AnswerverifiedShow Answer

Viral DNA inserted into a chromosome of the host is:

Correct AnswerverifiedShow Answer

Viruses are not considered to be alive,yet they share this ability with living cells:

Correct AnswerverifiedShow Answer

The shape of a virus is determined by:

Correct AnswerverifiedShow Answer

The enzyme that HIV uses to convert its RNA into DNA is:

Correct AnswerverifiedShow Answer

Poliomyelitis is an RNA virus that can invade the nervous system and cause paralysis within a matter of hours.Polio has been virtually eliminated world-wide by which of the following?

Correct AnswerverifiedShow Answer

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