Question 1

Severe acute respiratory syndrome (SARS) is a viral respiratory illness that was first reported in Asia in 2003. Which of the following viruses was identified as the cause for SARS in humans?

Accepted Answer

A)   Coronaviruses
B)   Enterovirus
C)   Filovirus
D)   Rotavirus

Question 2

Which of the following is used by negative strand RNA viruses such as measles and influenza during their replication cycle?

Accepted Answer

A)   synthesize DNA via reverse transcriptase
B)   synthesize a double stranded RNA intermediate
C)   synthesize an RNA:DNA hybrid whose RNA is a (+)  strand
D)   synthesize an RNA:DNA hybrid whose DNA is a (-)  strand

Question 3

A viral infection is ineffective by the treatment of anti-RNA drug. The most likely reason is that this virus is a

Accepted Answer

A)   picornavirus
B)   orthomyxovirus
C)   poxvirus
D)   reovirus

Question 4

Temperate phages

Accepted Answer

A)   do not always undergo a lytic cycle
B)   only replicate at certain temperatures
C)   are those that cause disease
D)   form plaques on bacterial lawns

Question 5

Viral DNA lying within a bacterial chromosome is called a ________ while the combination of a bacterial cell and its temperate phage is called a ________.

Accepted Answer

A)   prophage, lysogen
B)   plaque, lysogen
C)   lysogen, prophage
D)   prophage, retrovirus

Question 6

Because viruses such as bacteriophages lead to bursting of the bacterial host cell they are known as ________ viruses.

Accepted Answer

A)   lytic
B)   lysogenic
C)   recurring
D)   lethal

Question 7

Why was it previously believed that only DNA viruses can cause cancer? How can RNA viruses cause cancer?

Accepted Answer

Research shows that many DNA tumor virus...

Question 8

The advantage of the viral envelope includes:

Accepted Answer

A)   helps viruses infect new cells by fusion of the envelope with the host's plasma membrane.
B)   resists increased temperature
C)   resists extreme pH (below 6 or above 8) 
D)   protects viruses

Question 9

Which of the following is a FALSE statement about yellow fever?

Accepted Answer

A)   endemic to the United States
B)   the first human disease found to be caused by a virus
C)   the first confirmation that an insect could transmit a virus
D)   caused by a flavivirus
E)   its first name was yellow jack

Question 10

Which of the following explains how DNA tumor viruses may cause human cancers?

Accepted Answer

A)   viral proteins infect other uninfected host cells
B)   viral proteins block the effect of tumor-suppressor genes which prevent uncontrolled cell division
C)   viral particles infect sex cells and transmit the virions to offspring.
D)   use viral reverse transcriptase to integrate the DNA tumor viruses into the host chromosome

Question 11

Growth of a bacterium which contains a prophage represents a

Accepted Answer

A)   lytic cycle
B)   temperate cycle
C)   lysogenic cycle
D)   induction

Question 12

Bacteriophage DNA is transcribed to mRNA during the ________ phase of viral replication.

Accepted Answer

A)   penetration
B)   synthesis
C)   maturation
D)   release

Question 13

Diseases such as Creutzfeld-Jacob disease,kuru,and mad cow disease are caused by

Accepted Answer

A)   RNA viruses
B)   DNA viruses
C)   bacteria
D)   prions

Question 14

Viruses that have a single strand of RNA that acts as a template for DNA synthesis are known as

Accepted Answer

A)   retroviruses.
B)   proviruses.
C)   viroids.
D)   bacteriophages.
E)   lytic phages.

Question 15

A prion is made of which of the following?

Accepted Answer

A)   RNA
B)   DNA
C)   proteins
D)   both DNA and RNA

Question 16

Bacteriophages contain the enzyme lysozyme,which is used to

Accepted Answer

A)   replicate viral DNA.
B)   shut down bacterial cell metabolism.
C)   weaken bacterial cell walls.
D)   help recognize the proper bacterial host.

Question 17

Which of the following viruses are known for causing latent infections?

Accepted Answer

A)   adenoviruses
B)   herpesviruses
C)   poxviruses
D)   parvoviruses

Question 18

A latent viral infection is an infection in which

Accepted Answer

A)   a viral replication is slow
B)   a virus remains within host cells without causing a disease
C)   a viral infection causes a disease progression gradually over a long period
D)   a viral replication has stopped

Question 19

The families of RNA viruses are distinguished from one another by all of the following except

Accepted Answer

A)   presence of an envelope
B)   presence of a capsid and its shape
C)   sense or nonsense RNA
D)   whether RNA is linear or circular

Question 20

Which of the following structures do viruses use to attach themselves to the host cell and help viruses enter the host cells?

Accepted Answer

A)   viral spikes
B)   viral tails
C)   viral particles
D)   viral nucleic acid

Exam 10: Viruses

Which of the following is a FALSE statement about yellow fever?

Correct AnswerverifiedShow Answer

Which of the following structures do viruses use to attach themselves to the host cell and help viruses enter the host cells?

Correct AnswerverifiedShow Answer

Viruses that have a single strand of RNA that acts as a template for DNA synthesis are known as

Correct AnswerverifiedShow Answer

Temperate phages

Correct AnswerverifiedShow Answer

Because viruses such as bacteriophages lead to bursting of the bacterial host cell they are known as ________ viruses.

Correct AnswerverifiedShow Answer

The families of RNA viruses are distinguished from one another by all of the following except

Correct AnswerverifiedShow Answer

Which of the following viruses are known for causing latent infections?

Correct AnswerverifiedShow Answer

The advantage of the viral envelope includes:

Correct AnswerverifiedShow Answer

Why was it previously believed that only DNA viruses can cause cancer? How can RNA viruses cause cancer?

Correct AnswerverifiedResearch shows that many DNA tumor virus...View AnswerShow Answer

Severe acute respiratory syndrome (SARS) is a viral respiratory illness that was first reported in Asia in 2003. Which of the following viruses was identified as the cause for SARS in humans?

Correct AnswerverifiedShow Answer

Bacteriophage DNA is transcribed to mRNA during the ________ phase of viral replication.

Correct AnswerverifiedShow Answer

Growth of a bacterium which contains a prophage represents a

Correct AnswerverifiedShow Answer

Bacteriophages contain the enzyme lysozyme,which is used to

Correct AnswerverifiedShow Answer

A prion is made of which of the following?

Correct AnswerverifiedShow Answer

Diseases such as Creutzfeld-Jacob disease,kuru,and mad cow disease are caused by

Correct AnswerverifiedShow Answer

A latent viral infection is an infection in which

Correct AnswerverifiedShow Answer

Which of the following is used by negative strand RNA viruses such as measles and influenza during their replication cycle?

Correct AnswerverifiedShow Answer

Which of the following explains how DNA tumor viruses may cause human cancers?

Correct AnswerverifiedShow Answer

A viral infection is ineffective by the treatment of anti-RNA drug. The most likely reason is that this virus is a

Correct AnswerverifiedShow Answer

Viral DNA lying within a bacterial chromosome is called a ________ while the combination of a bacterial cell and its temperate phage is called a ________.

Correct AnswerverifiedShow Answer

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Research shows that many DNA tumor virus...
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Viral DNA lying within a bacterial chromosome is called a while the combination of a bacterial cell and its temperate phage is called a .

Correct Answer
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