Question 1

A scientist is studying the lysogenic cycle of the lambda 1 phage of Escherichia coli.This means that she is investigating

Accepted Answer

A)  the integration and stabilizing of the lambda 1 phase into a host cell's genome.
B)  the integration of the bacteria's genome with the viral genome outside of the bacteria's cell wall.
C)  the integration of the viral genome into the ribosomes present in the bacteria to direct protein synthesis for the capsid formation.
D)  the integration and stabilizing of a virus into its capsid, which provides protection until conditions are better for reproduction.E) All of the above
F) A) and C)

Question 2

Prions are

Accepted Answer

A)  strands of nucleic acids encased in a protein coat.
B)  viral nucleic acids integrated into the host chromosomes.
C)  viral-infected cells.
D)  infectious proteins with no associated nucleic acid.E) C) and D)
F) B) and C)

Question 3

Can a virus be killed?

Accepted Answer

A)  Yes, destroying its genome kills it.
B)  No, viruses are capable of self-assembly and cannot be permanently killed.
C)  Yes, separating the genes from the capsid kills it.
D)  No, viruses are non-living and cannot die.E) C) and D)
F) B) and D)

Question 4

Diseases such as scrapie in sheep, "mad cow" disease in cattle, and Creutzfeldt-Jakob disease in humans are known as

Accepted Answer

A)  viroids.
B)  viruses.
C)  retroviruses.
D)  TSEs (transmissible spongiform encephalopathies) .E) B) and C)
F) A) and D)

Question 5

Recently a class of infectious proteins with no associated nucleic acid have been identified.They are referred to as

Accepted Answer

A)  bacteriophages.
B)  latent viruses.
C)  viroids.
D)  prions.E) B) and D)
F) A) and B)

Question 6

Viruses are self-replicating but the replication is much faster in a host cell.

Accepted Answer

A) True 
 B)False

Question 7

The switch from a lysogenic prophage to a lytic cycle is called

Accepted Answer

A)  transformation.
B)  induction.
C)  latency.
D)  phage conversion.E) A) and B)
F) A) and C)

Question 8

The specific white blood cells that HIV attaches to are the ____________ cells.

Accepted Answer

A)  CD4+
B)  gp120 -T
C)  CCR5-T
D)  CXCR4-TE) A) and C)
F) A) and D)

Question 9

Which of the following is a unique feature of viruses that separates them from bacteria?

Accepted Answer

A)  They are generally smaller.
B)  They are often highly toxic.
C)  They lack proteins.
D)  They have different nucleotides in their hereditary material.E) A) and D)
F) A) and C)

Question 10

Which of the following statements about TSEs (transmissible spongiform encephalopathies)  is false?

Accepted Answer

A)  TSEs include scrapie in sheep, mad cow disease, chronic wasting disease in deer and elk, and kuru and variant Creutzfeldt-Jakob disease in humans.
B)  The incidence of Creutzfeldt-Jakob disease in humans increased after an outbreak of mad cow disease in England, suggesting that mad cow disease may be transmitted to humans.
C)  Viroids are the likely cause of TSEs.
D)  TSEs do not seem to be affected by treatments that would eliminate nucleic acid-based diseases.E) A) and B)
F) B) and C)

Exam 27: Viruses

Prions are

Correct Answer
verified

The specific white blood cells that HIV attaches to are the ____________ cells.

Correct Answer
verified

Can a virus be killed?

Correct Answer
verified

A scientist is studying the lysogenic cycle of the lambda 1 phage of Escherichia coli.This means that she is investigating

Correct Answer
verified

Recently a class of infectious proteins with no associated nucleic acid have been identified.They are referred to as

Correct Answer
verified

Which of the following statements about TSEs (transmissible spongiform encephalopathies) is false?

Correct Answer
verified

Viruses are self-replicating but the replication is much faster in a host cell.

Correct Answer
verified

The switch from a lysogenic prophage to a lytic cycle is called

Correct Answer
verified

Which of the following is a unique feature of viruses that separates them from bacteria?

Correct Answer
verified

Diseases such as scrapie in sheep, "mad cow" disease in cattle, and Creutzfeldt-Jakob disease in humans are known as

Correct Answer
verified

Exam 27: Viruses

Prions are

Correct AnswerverifiedShow Answer

The specific white blood cells that HIV attaches to are the ____________ cells.

Correct AnswerverifiedShow Answer

Can a virus be killed?

Correct AnswerverifiedShow Answer

A scientist is studying the lysogenic cycle of the lambda 1 phage of Escherichia coli.This means that she is investigating

Correct AnswerverifiedShow Answer

Recently a class of infectious proteins with no associated nucleic acid have been identified.They are referred to as

Correct AnswerverifiedShow Answer

Which of the following statements about TSEs (transmissible spongiform encephalopathies) is false?

Correct AnswerverifiedShow Answer

Viruses are self-replicating but the replication is much faster in a host cell.

Correct AnswerverifiedShow Answer

The switch from a lysogenic prophage to a lytic cycle is called

Correct AnswerverifiedShow Answer

Which of the following is a unique feature of viruses that separates them from bacteria?

Correct AnswerverifiedShow Answer

Diseases such as scrapie in sheep, "mad cow" disease in cattle, and Creutzfeldt-Jakob disease in humans are known as

Correct AnswerverifiedShow Answer

Correct Answer
verified

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Correct Answer
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Correct Answer
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