Question 1

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.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) B) and C)
G) A) and C)

Question 2

Human immunodeficiency virus (HIV) is classified as

Accepted Answer

A)   a skin-touch transmissable virus.
B)   a general mammalian infectious virus.
C)   a liver carcinogen.
D)   a retrovirus.
E)   responsive to antibiotics.F) A) and C)
G) C) and D)

Question 3

Most viruses

Accepted Answer

A)   infect only a few closely related species.
B)   only infect plant cells.
C)   cannot infect living cells.
D)   only infect animal cells.
E)   infect a wide variety of organisms.F) A) and E)
G) C) and D)

Question 4

When a lab technician collects viruses,grinds them,and then stains the extract for proteins,they are studying the

Accepted Answer

A)   RNA molecule of the virus.
B)   lipid coat of the virus.
C)   DNA molecule of the virus.
D)   space inside the virus where its genetic information is located.
E)   capsids of the virus.F) B) and E)
G) C) and E)

Question 5

The genetic information in viruses

Accepted Answer

A)   is found in the nucleus of the virus.
B)   is a specialized capsid protein.
C)   is always DNA.
D)   is always RNA.
E)   can be DNA or RNA.F) B) and C)
G) A) and E)

Question 6

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

Accepted Answer

A)   The only way to kill a virus is with a vaccine, not with drugs.
B)   People with HIV infections die very rapidly, before the drugs have a chance to cure them.
C)   HIV does not use any enzymes that can be targeted by drugs.
D)   HIV mutates rapidly among infected humans.
E)   HIV does not cause AIDS.F) C) and D)
G) A) and C)

Question 7

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

Accepted Answer

A)   lysogenic
B)   rare form of viral
C)   systematic
D)   transgenic
E)   lyticF) B) and C)
G) C) and D)

Question 8

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.When a patient becomes stressed,the virus is released,forming cold sores on the lips.Why is the cold sore adaptive to the virus?

Accepted Answer

A)   Cold sores allow the virus to move to another part of the body.
B)   Cold sores warn other people that the host is infected.
C)   Cold sores allow the virus to avoid the immune system.
D)   Cold sores allow the virus to spread to a new host.
E)   Cold sores allow the virus to mutate and survive antibiotic treatments.F) B) and E)
G) B) and D)

Question 9

Our most potent weapon in the fight against viruses is

Accepted Answer

A)   gene therapy.
B)   surgery.
C)   sulfa drugs.
D)   antibiotics.
E)   vaccinations.F) A) and E)
G) D) and E)

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

Viral DNA inserted into a chromosome of the host is a

Accepted Answer

A)   phage.
B)   reservoir.
C)   prophage.
D)   carrier.
E)   progenote.F) B) and D)
G) A) and C)

Question 12

A species is found to infect host fishes in isolated mountain lakes.The host range is

Accepted Answer

A)   impossible to determine, because the isolated lakes don't allow tests for the infection of other fishes.
B)   All of these definitions are applied by researchers, depending on the particular viruses of concern.
C)   the mountainous area, in which the isolated lakes are found and mapped.
D)   the one or more infected species of fishes that exhibit the viral disease symptoms.
E)   the specific sizes and shapes of the fish tissue cells that become infected by the viruses.F) None of the above
G) All of the above

Question 13

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

Accepted Answer

A)   release.
B)   synthesis.
C)   penetration.
D)   assembly.
E)   attachment.F) C) and D)
G) A) and B)

Question 14

If a physician diagnoses that a person has a viral infection,antibiotics are not considered an appropriate,effective means of treating viruses for which main reason?

Accepted Answer

A)   Antibiotics inhibit ribosome production of proteins.
B)   Antibiotics inhibit synthesis of cell walls.
C)   Antibiotics destroy DNA and RNA.
D)   All of these answer options except the destruction of DNA and RNA are common means of antibiotic action.
E)   Antibiotics inhibit enzymes.F) A) and D)
G) C) and D)

Question 15

Figuer:
Five different virus species are shown and labeled arrows indicate structures. 
-The virus structure indicated by the arrow labeled B is the

Accepted Answer

A)   the bacterial membrane.
B)   genetic material, DNA or RNA.
C)   the bacteriophage.
D)   the lipid-rich envelope.
E)   the protein coat, or capsid.F) B) and D)
G) B) and E)

Question 16

The structure of the anti-HIV drug azidothymidine (AZT) includes a phosphate group,a sugar group,and a nitrogen base,in the form of a nucleotide.Given its structure,how do you think it blocks viral replication?

Accepted Answer

A)   It inhibits host T cells from replicating.
B)   It blocks RNA synthesis by an enzyme.
C)   It prevents HIV from entering the cell.
D)   It inhibits the assembly of new viruses in the cell.
E)   It blocks host cell DNA synthesis by an enzyme.F) B) and D)
G) A) and D)

Question 17

Viruses

Accepted Answer

A)   consist of multiple cells.
B)   are smaller than cells.
C)   contain a nucleus.
D)   contain ribosomes.
E)   consist of only a single cell.F) B) and C)
G) B) and D)

Question 18

Viruses are not considered to be alive,yet they share with living cells the ability to _____.

Accepted Answer

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

Question 19

Hepatitis A and C contain an RNA genome,while hepatitis B contains a DNA genome.What is the most plausible conclusion you could draw about these strains of hepatitis?

Accepted Answer

A)   They all have the same mode of transmission.
B)   They do not all share a common ancestor.
C)   They all have the same symptoms.
D)   They all have the same rate of occurrence.
E)   They do not all affect the liver.F) A) and D)
G) A) and E)

Question 20

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 most viruses from easily entering plant cells?

Accepted Answer

A)   the cell wall on the virus
B)   the plasma membrane on the plant
C)   the protein coat on the virus
D)   the plasma membrane on the virus
E)   the cell wall on the plantF) B) and E)
G) All of the above

Exam 16: Viruses

Viruses

Correct Answer
verified

Viruses are not considered to be alive,yet they share with living cells the ability to _____.

Correct Answer
verified

Figuer: Five different virus species are shown and labeled arrows indicate structures. -The virus structure indicated by the arrow labeled B is the

Correct Answer
verified

The structure of the anti-HIV drug azidothymidine (AZT) includes a phosphate group,a sugar group,and a nitrogen base,in the form of a nucleotide.Given its structure,how do you think it blocks viral replication?

Correct Answer
verified

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.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 Answer
verified

Most viruses

Correct Answer
verified

If a physician diagnoses that a person has a viral infection,antibiotics are not considered an appropriate,effective means of treating viruses for which main reason?

Correct Answer
verified

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

Correct Answer
verified

When a lab technician collects viruses,grinds them,and then stains the extract for proteins,they are studying the

Correct Answer
verified

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.When a patient becomes stressed,the virus is released,forming cold sores on the lips.Why is the cold sore adaptive to the virus?

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Viral DNA inserted into a chromosome of the host is a

Correct Answer
verified

Our most potent weapon in the fight against viruses is

Correct Answer
verified

The genetic information in viruses

Correct Answer
verified

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

Correct Answer
verified

A species is found to infect host fishes in isolated mountain lakes.The host range is

Correct Answer
verified

Human immunodeficiency virus (HIV) is classified as

Correct Answer
verified

Hepatitis A and C contain an RNA genome,while hepatitis B contains a DNA genome.What is the most plausible conclusion you could draw about these strains of hepatitis?

Correct Answer
verified

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

Correct Answer
verified

Exam 16: Viruses

Viruses

Correct AnswerverifiedShow Answer

Viruses are not considered to be alive,yet they share with living cells the ability to _____.

Correct AnswerverifiedShow Answer

Figuer: Five different virus species are shown and labeled arrows indicate structures. -The virus structure indicated by the arrow labeled B is the

Correct AnswerverifiedShow Answer

The structure of the anti-HIV drug azidothymidine (AZT) includes a phosphate group,a sugar group,and a nitrogen base,in the form of a nucleotide.Given its structure,how do you think it blocks viral replication?

Correct AnswerverifiedShow Answer

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.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

Most viruses

Correct AnswerverifiedShow Answer

If a physician diagnoses that a person has a viral infection,antibiotics are not considered an appropriate,effective means of treating viruses for which main reason?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When a lab technician collects viruses,grinds them,and then stains the extract for proteins,they are studying the

Correct AnswerverifiedShow Answer

Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years.When a patient becomes stressed,the virus is released,forming cold sores on the lips.Why is the cold sore adaptive to the virus?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Viral DNA inserted into a chromosome of the host is a

Correct AnswerverifiedShow Answer

Our most potent weapon in the fight against viruses is

Correct AnswerverifiedShow Answer

The genetic information in viruses

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A species is found to infect host fishes in isolated mountain lakes.The host range is

Correct AnswerverifiedShow Answer

Human immunodeficiency virus (HIV) is classified as

Correct AnswerverifiedShow Answer

Hepatitis A and C contain an RNA genome,while hepatitis B contains a DNA genome.What is the most plausible conclusion you could draw about these strains of hepatitis?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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