Question 1

f an E. coli strain typically has 50 loop domains, how many total base pairs might this bacteria have in its chromosome?

Accepted Answer

A)   500-2,000
B)   5,000-20,000
C)   50,000-80,000
D)   200,000-450,000
E)   5 billionF) C) and D)
G) A) and D) D

Question 2

Bacteria contain plasmids because

Accepted Answer

A)   they are essential for growth.
B)   they provide genes that allow the bacteria to grow and thrive in the presence of potential toxins.
C)   they are essential for cellular respiration.
D)   humans artificially created plasmids and then inserted them into bacteria.
E)   they are essential for chromosome replication and binary fission.F) B) and E)
G) C) and E)

Question 3

Viroids have a genome but do not translate any of it to protein.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following hypotheses proposed to explain the evolutionary origin of viruses does not assume the pre-existence of living cells?

Accepted Answer

A)   Viruses evolved from macromolecules.
B)   Viruses evolved from plasmids that acquired genes for their own replication.
C)   Viruses evolved by losing all the genetic information that is not absolutely required for reproduction.
D)   The precursors of cellular DNA genomes may have been RNA molecules.
E)   Viruses evolved from chromosomal elements.F) C) and D)
G) A) and B) D

Question 5

The bacterial genetic material is

Accepted Answer

A)   held within a membrane-bound nucleus.
B)   localized to a nucleoid region.
C)   circular and loosely packed.D) None of the above
E) B) and C)

Question 6

How does the reproduction of HIV and lambda phage differ?

Accepted Answer

A)   HIV contains reverse transcriptase enzyme, while lambda phage does not.
B)   Immediately after HIV enters the cell, reverse transcriptase RNA is transcribed into DS DNA. Lambda phage reverse transcriptase DNA is integrated immediately into the host genome
C)   HIV contains integrase, while lambda phage does not.
D)   HIV attaches to specific proteins on the cell surface, while lambda phage does not.
E)   Lambda phage attaches to specific proteins on the cell surface, while HIV does not.F) B) and C)
G) All of the above

Question 7

Horizontal gene transfer occurs when one species of bacteria takes up the DNA of another species that released the DNA when it died.

Accepted Answer

A) True 
 B)False

Question 8

The ability to transfer DNA via conjugation is a universal feature of E. coli strains.

Accepted Answer

A) True 
 B)False

Question 9

A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prion's conformation. What effect might this have on the actions of scrapie?

Accepted Answer

A)   The shape change could prevent the scrapie protein from converting normal proteins to scrapie proteins.
B)   The shape change could induce scrapie protease activity.
C)   The shape change could stop the transcription of scrapie RNA.
D)   The shape change could stop the replication of scrapie DNA.
E)   The shape change could block the translation of scrapie RNA.F) A) and D)
G) A) and E) A

Question 10

Which of the following is not an emerging virus?

Accepted Answer

A)   HIV
B)   SARS
C)   influenza
D)   Epstein Barr
E)   All of these choices are emerging viruses.F) A) and C)
G) B) and D)

Question 11

Viral release from a eukaryotic cell

Accepted Answer

A)   requires the production of lysozyme encoded by the viral genome.
B)   requires the production of lysozyme encoded by the eukaryotic genome.
C)   is essential to envelope formation.
D)   kills the infected cell.
E)   requires the production of lysozyme encoded by the viral genome and kills the infected cell.F) All of the above
G) B) and E)

Question 12

Which of the following does not contribute to the infectious ability of prions?

Accepted Answer

A)   Prion proteins are not digested.
B)   Prion proteins can induce the misfolding of normal proteins.
C)   Prion proteins can enter the bloodstream.
D)   Prion proteins are deposited as aggregates.
E)   Prion diseases progress slowly.F) All of the above
G) B) and D)

Question 13

The chromosome must be ___________ in order to fit into the bacterial cell.

Accepted Answer

A)   supercoiled by topoisomerases
B)   supercoiled around histone proteins
C)   organized into loop domains by topiosomerases
D)   compacted into a nucleosome
E)   both organized into loop domains and supercoiled by topoisomerasesF) B) and C)
G) B) and D)

Question 14

The two daughter cells that are formed as a result of binary fission

Accepted Answer

A)   each have about half the number of plasmids as the mother cell.
B)   are members of the same colony.
C)   have genetically identical chromosomes.
D)   Two of the answers are correct. They are members of the same colony and have genetically identical chromosomes.
E)   All of these statements are correct.F) A) and D)
G) B) and E)

Exam 18: Genetics of Viruses and Bacteria

f an E. coli strain typically has 50 loop domains, how many total base pairs might this bacteria have in its chromosome?

Correct Answer
verified
D

Bacteria contain plasmids because

Correct Answer
verified

Viroids have a genome but do not translate any of it to protein.

Correct Answer
verified

Which of the following hypotheses proposed to explain the evolutionary origin of viruses does not assume the pre-existence of living cells?

Correct Answer
verified
D

The bacterial genetic material is

Correct Answer
verified

How does the reproduction of HIV and lambda phage differ?

Correct Answer
verified

Horizontal gene transfer occurs when one species of bacteria takes up the DNA of another species that released the DNA when it died.

Correct Answer
verified

The ability to transfer DNA via conjugation is a universal feature of E. coli strains.

Correct Answer
verified

A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prion's conformation. What effect might this have on the actions of scrapie?

Correct Answer
verified
A

Which of the following is not an emerging virus?

Correct Answer
verified

Viral release from a eukaryotic cell

Correct Answer
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Which of the following does not contribute to the infectious ability of prions?

Correct Answer
verified

The chromosome must be ___________ in order to fit into the bacterial cell.

Correct Answer
verified

The two daughter cells that are formed as a result of binary fission

Correct Answer
verified

Exam 18: Genetics of Viruses and Bacteria

f an E. coli strain typically has 50 loop domains, how many total base pairs might this bacteria have in its chromosome?

Correct AnswerverifiedD

Bacteria contain plasmids because

Correct AnswerverifiedShow Answer

Viroids have a genome but do not translate any of it to protein.

Correct AnswerverifiedShow Answer

Which of the following hypotheses proposed to explain the evolutionary origin of viruses does not assume the pre-existence of living cells?

Correct AnswerverifiedD

The bacterial genetic material is

Correct AnswerverifiedShow Answer

How does the reproduction of HIV and lambda phage differ?

Correct AnswerverifiedShow Answer

Horizontal gene transfer occurs when one species of bacteria takes up the DNA of another species that released the DNA when it died.

Correct AnswerverifiedShow Answer

The ability to transfer DNA via conjugation is a universal feature of E. coli strains.

Correct AnswerverifiedShow Answer

A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prion's conformation. What effect might this have on the actions of scrapie?

Correct AnswerverifiedA

Which of the following is not an emerging virus?

Correct AnswerverifiedShow Answer

Viral release from a eukaryotic cell

Correct AnswerverifiedShow Answer

Which of the following does not contribute to the infectious ability of prions?

Correct AnswerverifiedShow Answer

The chromosome must be ___________ in order to fit into the bacterial cell.

Correct AnswerverifiedShow Answer

The two daughter cells that are formed as a result of binary fission

Correct AnswerverifiedShow Answer

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D

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D

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A

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