Question 1

Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere?

Accepted Answer

A)   water vapor (H2O) 
B)   methane (CH4) 
C)   hydrogen (H2) 
D)   oxygen (O2) 
E)   nitrogen (N2) F) A) and B)
G) C) and E)

Question 2

What feature enables the Archaea to survive in harsh environments?

Accepted Answer

A)   Their cell walls.
B)   Their nucleus.
C)   Their metabolism.
D)   The ability to form multicellular organisms.
E)   Their reproductive capabilities.F) A) and B)
G) A) and C)

Question 3

Which statement is NOT true about prion diseases?

Accepted Answer

A)   Prions are believed to cause Creutzfeldt-Jakob disease (CJ
D)  .
B)   Prions lack a nucleus but must form DNA/RNA at some time in order to replicate.
C)   Prions are misshapen proteins that cause other proteins to change shape.
D)   Mad cow disease (BS
E)   is spread by consumption of cattle feed contaminated with prions.
E)   The build up of these abnormal proteins causes a loss of neurons.F) None of the above
G) B) and C)

Question 4

Which stage of viral reproduction takes place when the spikes of the virus bind to a specific receptor molecule on the surface of a host cell?

Accepted Answer

A)   attachment stage
B)   penetration stage
C)   biosynthesis stage
D)   maturation stage
E)   release stageF) C) and D)
G) C) and E)

Question 5

Which of the following is NOT true about viruses?

Accepted Answer

A)   The genome may be DNA or RNA.
B)   The nucleic acid may be single or double stranded.
C)   They contain nucleic acid, protein, and mitochondria.
D)   They exhibit host specificity.
E)   They are obligate intracellular parasites.F) A) and C)
G) A) and B)

Exam 28: Microbiology

Which stage of viral reproduction takes place when the spikes of the virus bind to a specific receptor molecule on the surface of a host cell?

Correct Answer
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Which of the following is NOT true about viruses?

Correct Answer
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Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere?

Correct Answer
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Which statement is NOT true about prion diseases?

Correct Answer
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What feature enables the Archaea to survive in harsh environments?

Correct Answer
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Exam 28: Microbiology

Which stage of viral reproduction takes place when the spikes of the virus bind to a specific receptor molecule on the surface of a host cell?

Correct AnswerverifiedShow Answer

Which of the following is NOT true about viruses?

Correct AnswerverifiedShow Answer

Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere?

Correct AnswerverifiedShow Answer

Which statement is NOT true about prion diseases?

Correct AnswerverifiedShow Answer

What feature enables the Archaea to survive in harsh environments?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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