Question 1

Viruses that infect bacteria are:

Accepted Answer

A)  Not known to exist
B)  Prions
C)  Bacteriophages
D)  Composed of protein only
E)  Also capable of causing disease in humansF) A) and E)
G) B) and C)

Question 2

Smallpox is an enveloped virus with a DNA genome.We have eliminated this once deadly virus through an aggressive world-wide vaccination program.Why might a vaccine be successful with smallpox,but not with HIV?

Accepted Answer

A)  Because smallpox is an enveloped virus
B)  Because viruses with DNA genomes must replicate inside a host cell
C)  Because RNA is more stable than DNA, and is less likely to be destroyed by the vaccine
D)  Because host cells have RNA in them, and thus don't raise antibodies against RNA
E)  Because DNA genomes mutate less rapidly than RNA genomesF) C) and E)
G) A) and E)

Question 3

An infectious protein is a:

Accepted Answer

A)  Virus
B)  Viroid
C)  Prion
D)  Virion
E)  ProphageF) A) and B)
G) A) and C)

Question 4

Viruses can infect all higher life forms such as plants and animals,but cannot infect bacteria.

Accepted Answer

A) True 
 B)False

Question 5

Hepatitis A and C contain an RNA genome while hepatitis B contains a DNA genome.What could you conclude about these hepatitis viruses?

Accepted Answer

A)  They do not all share a common ancestor
B)  They do not all affect the liver
C)  They all have the same symptoms
D)  They all have the same mode of transmission
E)  They all have the same rate of occurrenceF) None of the above
G) A) and B) A

Question 6

The type of viral infection in which a virus enters a host cell immediately replicates and causes the host cell to burst is:

Accepted Answer

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

Question 7

The genetic information in viruses:

Accepted Answer

A)  Is found in the nucleus of the virus
B)  Is always DNA
C)  Can be DNA or RNA
D)  Is always RNA
E)  Can be replicated outside of a cellF) None of the above
G) C) and D)

Question 8

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.While lying dormant the virus is in which of the following states?

Accepted Answer

A)  Lysogenic
B)  Symptomatic
C)  Latent
D)  Replicative
E)  InfectiveF) A) and E)
G) A) and B)

Question 9

The Human Immunodeficiency Virus (HIV) only affects a specific class of cells in the immune system called T helper cells,and not other types of T cells.Which is the best explanation for this observation?

Accepted Answer

A)  HIV can only replicate inside of T helper cells
B)  Only T helper cells have reverse transcriptase
C)  The T helper cells are not necessary for the immune system to fight viral infections
D)  Only T helper cells have the correct receptor on their cell surface
E)  HIV can only be released from T helper cellsF) A) and B)
G) D) and E) D

Question 10

HIV is a:

Accepted Answer

A)  Double-stranded DNA virus
B)  Single-stranded RNA virus
C)  Single-stranded DNA virus
D)  Double-stranded RNA virus
E)  PrionF) D) and E)
G) A) and E)

Question 11

Since viruses have no active methods of entering plant cells,they must rely upon mechanically caused wounds,vegetative propagation of plants,grafting,seed,pollen,and being carried on the mouth parts of chewing insects.Tobacco mosaic virus is most commonly introduced into plants through small wounds caused by handling and by insects chewing on plant parts.What would prevent viruses from easily entering plant cells?

Accepted Answer

A)  The cell wall on the virus
B)  The plasma membrane on the plant
C)  The cell wall on the plant
D)  The plasma membrane on the virus
E)  The protein coat on the virusF) C) and D)
G) None of the above

Question 12

figure 15.9 
-If a person is treated with a single anti-HIV drug,they often end up with a resistant strain.How does this occur?

Accepted Answer

A)  The drugs weaken the immune system, making a patient more susceptible to infection with resistant strains of HIV
B)  The drug causes mutations in the HIV, making them resistant to the drug
C)  The drugs kill all sensitive viruses, leaving only the pre-existing resistant viruses
D)  The HIV wants to avoid the drug, so it becomes resistantE) B) and C)
F) A) and B)

Question 13

The stage of viral replication in which the viral nucleic acid is released inside the cell is:

Accepted Answer

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

Question 14

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.Why would the virus form a cold sore?

Accepted Answer

A)  To allow it to spread to a new host
B)  So that it can mutate and survive an antibiotic treatments
C)  To move to another part of the body
D)  To avoid the immune system
E)  To warn other people that the host is infectedF) A) and E)
G) A) and C)

Question 15

HIV:

Accepted Answer

A)  Is a retrovirus
B)  Infects most mammals
C)  Can be killed with antibiotics
D)  Causes liver cancer
E)  Can be transmitted through the skinF) A) and B)
G) A) and C)

Question 16

The host range of a virus is:

Accepted Answer

A)  The geographical location in which the virus is found
B)  The type of organisms or cells that a virus can infect
C)  Determined by receptor molecules on living cells
D)  Determined by the prey it feeds on
E)  The biome it is found inF) B) and D)
G) All of the above

Question 17

An infectious RNA molecule is a:

Accepted Answer

A)  Virus
B)  Virion
C)  Viroid
D)  Prion
E)  ProphageF) A) and E)
G) B) and D)

Question 18

A reason or reasons given by scientists as to why viruses are not considered living organisms include:

Accepted Answer

A)  Viruses do not contain genetic information
B)  Viruses do not reproduce on their own
C)  Viruses are all smaller than the smallest known cells
D)  Viruses do not contain a nucleus
E)  Viruses can be frozen and still surviveF) C) and D)
G) B) and E)

Question 19

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.In a cold sore,the virus is in which of the following states?

Accepted Answer

A)  Latent
B)  Lysogenic
C)  Assembly
D)  Remissive
E)  AsymptomaticF) A) and B)
G) A) and C)

Question 20

Drugs like Aziodothymidine (AZT) :

Accepted Answer

A)  Inhibit viral DNA from inserting into the host chromosome
B)  Inhibit the cleaving of proteins needed to make the protein coat of a virus
C)  Inhibit host cells from reproducing
D)  Inhibit reverse transcriptase
E)  Inhibit viruses from entering a host cellF) B) and D)
G) A) and B) D

Exam 15: Viruses

Viruses that infect bacteria are:

Correct Answer
verified

Smallpox is an enveloped virus with a DNA genome.We have eliminated this once deadly virus through an aggressive world-wide vaccination program.Why might a vaccine be successful with smallpox,but not with HIV?

Correct Answer
verified

An infectious protein is a:

Correct Answer
verified

Viruses can infect all higher life forms such as plants and animals,but cannot infect bacteria.

Correct Answer
verified

Hepatitis A and C contain an RNA genome while hepatitis B contains a DNA genome.What could you conclude about these hepatitis viruses?

Correct Answer
verified
A

The type of viral infection in which a virus enters a host cell immediately replicates and causes the host cell to burst is:

Correct Answer
verified

The genetic information in viruses:

Correct Answer
verified

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.While lying dormant the virus is in which of the following states?

Correct Answer
verified

The Human Immunodeficiency Virus (HIV) only affects a specific class of cells in the immune system called T helper cells,and not other types of T cells.Which is the best explanation for this observation?

Correct Answer
verified
D

HIV is a:

Correct Answer
verified

Correct Answer
verified

figure 15.9 -If a person is treated with a single anti-HIV drug,they often end up with a resistant strain.How does this occur?

Correct Answer
verified

The stage of viral replication in which the viral nucleic acid is released inside the cell is:

Correct Answer
verified

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.Why would the virus form a cold sore?

Correct Answer
verified

HIV:

Correct Answer
verified

The host range of a virus is:

Correct Answer
verified

An infectious RNA molecule is a:

Correct Answer
verified

A reason or reasons given by scientists as to why viruses are not considered living organisms include:

Correct Answer
verified

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.In a cold sore,the virus is in which of the following states?

Correct Answer
verified

Drugs like Aziodothymidine (AZT) :

Correct Answer
verified
D

Exam 15: Viruses

Viruses that infect bacteria are:

Correct AnswerverifiedShow Answer

Smallpox is an enveloped virus with a DNA genome.We have eliminated this once deadly virus through an aggressive world-wide vaccination program.Why might a vaccine be successful with smallpox,but not with HIV?

Correct AnswerverifiedShow Answer

An infectious protein is a:

Correct AnswerverifiedShow Answer

Viruses can infect all higher life forms such as plants and animals,but cannot infect bacteria.

Correct AnswerverifiedShow Answer

Hepatitis A and C contain an RNA genome while hepatitis B contains a DNA genome.What could you conclude about these hepatitis viruses?

Correct AnswerverifiedA

The type of viral infection in which a virus enters a host cell immediately replicates and causes the host cell to burst is:

Correct AnswerverifiedShow Answer

The genetic information in viruses:

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.While lying dormant the virus is in which of the following states?

Correct AnswerverifiedShow Answer

The Human Immunodeficiency Virus (HIV) only affects a specific class of cells in the immune system called T helper cells,and not other types of T cells.Which is the best explanation for this observation?

Correct AnswerverifiedD

HIV is a:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

figure 15.9 -If a person is treated with a single anti-HIV drug,they often end up with a resistant strain.How does this occur?

Correct AnswerverifiedShow Answer

The stage of viral replication in which the viral nucleic acid is released inside the cell is:

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.Why would the virus form a cold sore?

Correct AnswerverifiedShow Answer

HIV:

Correct AnswerverifiedShow Answer

The host range of a virus is:

Correct AnswerverifiedShow Answer

An infectious RNA molecule is a:

Correct AnswerverifiedShow Answer

A reason or reasons given by scientists as to why viruses are not considered living organisms include:

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.In a cold sore,the virus is in which of the following states?

Correct AnswerverifiedShow Answer

Drugs like Aziodothymidine (AZT) :

Correct AnswerverifiedD

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D