Question 1

A naked virus only has a/n

Accepted Answer

A)  capsid.
B)  capsomere.
C)  nucleocapsid.
D)  envelope.
E)  antigenic surface.F) A) and B)
G) B) and E)

Question 2

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) None of the above
F) A) and D)

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) A) and D)
G) None of the above

Question 4

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

Accepted Answer

A)  Caudovirales
B)  Vaccinia virus
C)  Nidovirales
D)  MononegaviralesE) All of the above
F) A) and C)

Question 5

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) A) and B)
G) A) and C)

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

Viruses are simple,noncellular,and lack mRNA.

Accepted Answer

A) True 
 B)False

Question 8

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) B) and D)

Question 9

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) B) and C)
F) A) and D)

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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) B) and D)
G) All of the above

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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) B) and E)
G) A) and B)

Question 14

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 15

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) A) and B)
F) A) and C)

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

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) B) and C)
G) A) and B)

Question 18

Viral tissue specificities are called

Accepted Answer

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

Question 19

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) B) and E)
G) A) and E)

Question 20

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 D)
F) A) and C)

Exam 6: An Introduction to the Viruses

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Viral tissue specificities are called

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Viral spikes

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Viruses are simple,noncellular,and lack mRNA.

Correct AnswerverifiedShow Answer

A naked virus only has a/n

Correct AnswerverifiedShow Answer

All of the following pertain to virus envelopes except

Correct AnswerverifiedShow Answer

A negative RNA virus must first

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

T-even phages

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

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 _.

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