Question 1

Tamiflu is a common medication given for influenza treatment,its action being to protect and block sialic acid molecules on the surfaces of host cells and influenza virus envelopes as they leave the cell.Which statement reflects the mechanism of Tamiflu's action?

Accepted Answer

A)  Tamiflu blocks protein synthesis of the viral genome.
B)  Tamiflu interferes with the replication of +ssRNA from the -ssRNA genome of the flu virus.
C)  Tamiflu interferes with the release of the budding viruses from the infected host cells.
D)  Tamiflu interferes with the metabolic properties of the virus.E) All of the above
F) B) and D)

Question 2

A specific animal virus has the ability to attach to and enter almost any animal host cell.

Accepted Answer

A) True 
 B)False

Question 3

A/n _____ is the protein shell around the nucleic acid core of a virus.

Accepted Answer

A)  capsomere
B)  capsid
C)  spike
D)  envelope
E)  monolayerF) None of the above
G) A) and E)

Question 4

In general,most DNA viruses multiply in the host cell's _____,while most RNA viruses multiply in the host cell's _____.

Accepted Answer

A)  nucleus;cytoplasm
B)  cytoplasm;cell membrane
C)  cell membrane;cytoplasm
D)  cytoplasm;nucleus
E)  nucleus;endoplasmic reticulumF) None of the above
G) A) and B)

Question 5

Viral tissue specificities are called

Accepted Answer

A)  ranges.
B)  virions.
C)  receptacles.
D)  tropisms.
E)  uncoating.F) A) and C)
G) B) and D)

Question 6

Viruses are simple,noncellular,and lack mRNA.

Accepted Answer

A) True 
 B)False

Question 7

All of the following pertain to virus envelopes except

Accepted Answer

A)  gained as a virus leaves the host cell membrane.
B)  gained as a virus leaves the nuclear membrane.
C)  contain special virus proteins.
D)  help the virus particle attach to host cells.
E)  located between the capsid and nucleic acid.F) C) and D)
G) A) and B)

Question 8

Bacteriophages do not undergo adsorption to specific host cell receptors prior to penetration.

Accepted Answer

A) True 
 B)False

Question 9

A negative RNA virus must first

Accepted Answer

A)  synthesize a DNA copy of its genome.
B)  synthesize a negative RNA copy of its genome.
C)  synthesize a positive RNA copy of its genome.
D)  transcribe reverse transcriptase.
E)  transcribe RNA polymerase.F) A) and D)
G) A) and E)

Question 10

Each virus is assigned a genus status based on its host,target tissue,and type of disease it causes.

Accepted Answer

A) True 
 B)False

Question 11

A naked virus only has a/n

Accepted Answer

A)  capsid.
B)  capsomere.
C)  nucleocapsid.
D)  envelope.
E)  antigenic surface.F) D) and E)
G) None of the above

Question 12

Classification of viruses into families involves determining all the following characteristics except

Accepted Answer

A)  type of nucleic acid.
B)  type of capsid.
C)  presence of an envelope.
D)  biochemical reactions.
E)  number of strands in the nucleic acid.F) All of the above
G) C) and E)

Question 13

A treatment for bacterial infections from the early 20th century has made a comeback-the use of bacterial viruses to eliminate bacterial infections.Which explanation most accurately describes this mechanism of action behind this treatment?

Accepted Answer

A)  A wide variety of bacteria cause a large percentage of human infections,producing much sickness and death.
B)  Viruses can infect bacteria,transferring pathogenic genes.The viral genes can then be suppressed,causing the bacteria to not replicate viruses.
C)  The attachment structures on the virus and the receptors on the host cells make for exquisite specificity of viruses for particular bacterial species.
D)  Antibiotic resistance in humans is on the increase,so using a different kind of therapy is more beneficial.E) A) and C)
F) A) and D)

Question 14

Viral spikes

Accepted Answer

A)  are always present on enveloped viruses.
B)  attach the viral capsid and envelope.
C)  allow bacteria to evade host defenses.
D)  are derived from host proteins.
E)  are for recognition among the various types of viruses.F) A) and E)
G) C) and E)

Question 15

Prophages can be activated into viral replication and enter the lytic cycle.

Accepted Answer

A) True 
 B)False

Question 16

Diagnosis of viral infections sometimes involves analyzing the patient's blood for specific _____ that the immune system produces against the virus.

Accepted Answer

A)  glycoproteins
B)  antibodies
C)  complement proteins
D)  antigensE) B) and C)
F) A) and D)

Question 17

Which of the following is not a viral order in the classification system?

Accepted Answer

A)  Caudovirales
B)  Vaccinia virus
C)  Nidovirales
D)  MononegaviralesE) B) and C)
F) None of the above

Question 18

Viruses are considered ultramicroscopic because they range in size from 2 mm to 450 mm.

Accepted Answer

A) True 
 B)False

Question 19

Visible,clear,well-defined patches in a monolayer of virus-infected cells in a culture are called

Accepted Answer

A)  patches.
B)  buds.
C)  plaques.
D)  cytopathic effects.
E)  pocks.F) B) and C)
G) A) and B)

Question 20

T-even phages

Accepted Answer

A)  include the poxviruses.
B)  infect Escherichia coli cells.
C)  enter host cells by engulfment.
D)  have helical capsids.E) None of the above
F) A) and B)

Exam 6: An Introduction to the Viruses

A negative RNA virus must first

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Bacteriophages do not undergo adsorption to specific host cell receptors prior to penetration.

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Which of the following is not a viral order in the classification system?

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Visible,clear,well-defined patches in a monolayer of virus-infected cells in a culture are called

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Viral spikes

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Viral tissue specificities are called

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Each virus is assigned a genus status based on its host,target tissue,and type of disease it causes.

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A/n _____ is the protein shell around the nucleic acid core of a virus.

Correct AnswerverifiedShow Answer

Tamiflu is a common medication given for influenza treatment,its action being to protect and block sialic acid molecules on the surfaces of host cells and influenza virus envelopes as they leave the cell.Which statement reflects the mechanism of Tamiflu's action?

Correct AnswerverifiedShow Answer

Viruses are considered ultramicroscopic because they range in size from 2 mm to 450 mm.

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A specific animal virus has the ability to attach to and enter almost any animal host cell.

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Viruses are simple,noncellular,and lack mRNA.

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Diagnosis of viral infections sometimes involves analyzing the patient's blood for specific _____ that the immune system produces against the virus.

Correct AnswerverifiedShow Answer

All of the following pertain to virus envelopes except

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A naked virus only has a/n

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Prophages can be activated into viral replication and enter the lytic cycle.

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T-even phages

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Classification of viruses into families involves determining all the following characteristics except

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A treatment for bacterial infections from the early 20th century has made a comeback-the use of bacterial viruses to eliminate bacterial infections.Which explanation most accurately describes this mechanism of action behind this treatment?

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In general,most DNA viruses multiply in the host cell's _____,while most RNA viruses multiply in the host cell's _____.

Correct AnswerverifiedShow Answer

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In general,most DNA viruses multiply in the host cell's _,while most RNA viruses multiply in the host cell's _.

Correct Answer
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