Question 1

The purpose of the sex pilus is to ____.

Accepted Answer

A)   connect bacterial cells so a cytoplasmic bridge can form for conjugation
B)   form a gap junction between bacterial cells for conjugation
C)   block cytoplasmic exchange
D)   enable bacteriophage infection
E)   lyse the cellF) B) and C)
G) C) and E)

Question 2

Hfr cells are bacterial cells that ____.

Accepted Answer

A)   perform meiosis
B)   have the F factor integrated into their chromosome
C)   maintain the F factor in a plasmid
D)   have a low frequency of recombination
E)   have received DNA from a bacteriophageF) All of the above
G) A) and D)

Question 3

Which statement correctly describes horizontal gene transfer?

Accepted Answer

A)   Conjugation, transformation, and transduction are all forms of horizontal gene transfer.
B)   Conjugation and transformation are forms of horizontal gene transfer, but transduction is a form of vertical gene transfer.
C)   Eukaryote-eukaryote transfers of nuclear genes are most common.
D)   Prokaryote-eukaryote transfers of nuclear genes are most common.
E)   Partial diploids never result from horizontal gene transfer.F) B) and D)
G) B) and E)

Question 4

A colony of mice is treated with a nonvirulent strain of the bacterium Streptococcus pneumoniae . Before treatment, a researcher exposed this nonvirulent strain to heat-killed cells of a virulent strain. What will be the effect on the mouse population?

Accepted Answer

A)   The mice will all remain healthy.
B)   Some mice will develop a paralytic condition, but most will remain healthy.
C)   Most or all of the mice will develop pneumonia.
D)   Some mice will develop pneumonia, but most will remain healthy.
E)   The mice will become immune to the bacteria.F) All of the above
G) A) and D)

Question 5

The results of Lederberg and Tatum's experiments with E. coli auxotrophs indicated that ____.

Accepted Answer

A)   bacteria can be transformed when free DNA is available in their environment
B)   bacteria are able to exchange genetic material with eukaryotic organisms
C)   bacteria reproduce by sexual rather than asexual reproduction
D)   genetic recombination can occur in bacteria
E)   genetic recombination does not occur in bacteria since they do not undergo meiosisF) B) and D)
G) B) and E)

Question 6

How do the constituents of liquid medium differ from solid, gel-like medium?

Accepted Answer

A)   Liquid medium contains agar, a polysaccharide extracted from algae.
B)   Solid medium contains agar, a polysaccharide extracted from algae.
C)   Solid medium contains agar, a complex lipid extracted from bacterial membranes.
D)   Liquid medium contains more salts, which lower the freezing point.
E)   Solid medium contains more fatty acids, which raise the melting point.F) A) and B)
G) None of the above

Question 7

-cell, the sex pilus must be in place for at least ____ minutes. A)  0 B)  6 C)  10 D)  14 E)  25" class="answers-bank-image d-inline" rel="preload" > Figure 17.2
-
The accompanying figure above shows the distances between genes in minutes. Assume that the time listed between two genes corresponds to the transfer time of the first of the two genes in the pair. Use the figure to answer questions.
In order to transfer gene a to an F-cell, the sex pilus must be in place for at least ____ minutes.

Accepted Answer

A)   0
B)   6
C)   10
D)   14
E)   25F) A) and C)
G) A) and E)

Question 8

Match between columns
                        Premises: Lytic cycle
Reverse transcriptase
Latent stage
Transduction
Conjugation
Capsid
T-even bacteriophages
Bacteriophage lambda
Temperate phage
Retrovirus
Prophage
Virulent phage
Lysogenic cycle

Accepted Answer

The Answer of Type of virus that kills a host is...

Question 9

Prions ____.

Accepted Answer

A)   are more complex than viruses
B)   have large DNA genomes
C)   cause neurodegenerative disorders in mammals
D)   infect plant cells
E)   encode their own polymerases for nucleic acid replicationF) A) and B)
G) A) and C)

Question 10

The core of a virus is a ____ molecule.

Accepted Answer

A)   protein
B)   sugar
C)   nucleic acid
D)   fat
E)   phosphateF) A) and B)
G) A) and C)

Question 11

Figure 17.2
-
The accompanying figure above shows the distances between genes in minutes. Assume that the time listed between two genes corresponds to the transfer time of the first of the two genes in the pair. Use the figure to answer questions .
According to the accompanying figure, what is the order in which the genes will be transferred to an F- cell during conjugation?

Accepted Answer

A)   c-d-a-b
B)   d-a-b-c
C)   b-c-d-a
D)   a-b-c-d
E)   d-c-a-bF) None of the above
G) A) and C)

Question 12

-. C)  The donor cell produced an abnormal sex pilus. D)  All of the genes could not fit through the sex pilus at one time. E)  The sex pilus was broken before the rest of the genes could be transferred." class="answers-bank-image d-inline" rel="preload" > Figure 17.2
-
The accompanying figure above shows the distances between genes in minutes. Assume that the time listed between two genes corresponds to the transfer time of the first of the two genes in the pair. Use the figure to answer questions .
Suppose that after bacterial conjugation, the recipient cell contained the a and b genes. From this information, what can you conclude?

Accepted Answer

A)   The donor cell was unable to make contact with the recipient cell.
B)   The donor cell was F-.
C)   The donor cell produced an abnormal sex pilus.
D)   All of the genes could not fit through the sex pilus at one time.
E)   The sex pilus was broken before the rest of the genes could be transferred.F) A) and E)
G) B) and D)

Question 13

Arrange the following steps of the HIV life cycle in order: 1.Viral RNAs and proteins assemble into new viral particles that bud from the cell.
2) DNA copy of the viral genome is integrated into the host genome.
3) Viral reverse transcriptase makes a double-stranded DNA copy of the viral RNA genome.
4) Viral particle enters the cell.
5) The provirus is transcribed into viral RNA genomes and mRNAs to make viral proteins.

Accepted Answer

A)   3,2,5,1,4
B)   2,3,4,5,1
C)   4,2,3,1,5
D)   2,4,3,5,1
E)   4,3,2,5,1F) A) and E)
G) D) and E)

Question 14

During bacterial conjugation, bacteria use a long tubular structure called a(n)  ____ to contact each other.

Accepted Answer

A)   metabolic pilus
B)   asexual pilus
C)   flagellum
D)   cilia
E)   sex pilusF) A) and B)
G) B) and D)

Question 15

Bacteria that undergo natural transformation ____.

Accepted Answer

A)   are very common
B)   are strains of E. coli
C)   are subjected to electroporation to induce DNA uptake
D)   generally have a DNA-binding protein on the exterior of their cell wall
E)   integrate foreign DNA into their chromosome through conjugationF) B) and C)
G) A) and B)

Question 16

T-even bacteriophages ____.

Accepted Answer

A)   infect E. coli
B)   are nonvirulent
C)   consist of a head with no tail
D)   contain two molecules of double-stranded DNA in their head
E)   are temperate bacteriophages that do not have a lytic cycleF) B) and E)
G) A) and B)

Question 17

The series of events from infection of a cell through the release of progeny phages from a lysed cell is called the ____ cycle.

Accepted Answer

A)   lytic
B)   lysogenic
C)   Krebs
D)   citric acid
E)   lytic or lysogenicF) A) and B)
G) D) and E)

Question 18

How does a phage transfer DNA from one bacterium to another?

Accepted Answer

A)   Phages form a bridge between bacterial cells that allows DNA to pass from the host cell to the recipient cell.
B)   Phages form a bridge between bacterial cells that allows DNA to pass in both directions between the two cells.
C)   Phages lyse bacterial cells, releasing bacterial DNA into the environment, which is taken up by other phages for transfer to new cells.
D)   When phages assemble in an infected bacterial cell, they may incorporate host DNA; released phages may attach to other cells and inject the bacterial DNA into those cells.
E)   Phages attach to receptors on bacterial cells and receive some of the target cells' DNA; the phages release this DNA into the environment to be taken up by other bacterial cells.F) B) and D)
G) B) and C)

Question 19

Conjugation, transduction, and transformation are the three main mechanisms for gene transfer between bacteria. Compare these three mechanisms in terms of how DNA is transferred.

Accepted Answer

Conjugation involves the transfer of DNA...

Question 20

Figure 17.1
Use the accompanying figure .
If strains 1 and 2 conjugate and are plated on minimal medium, cells growing on the minimal medium will have the genotype ____.

Accepted Answer

A)   bio- met- thr- leu+
B)   bio+ met+ thr+ leu+
C)   bio+ met- thr- leu+
D)   bio+ met+ thr- leu+
E)   bio- met- thr- leu-F) C) and D)
G) B) and E)

Exam 17: Bacterial and Viral Genetics

Correct Answer
verified

During bacterial conjugation, bacteria use a long tubular structure called a(n) ____ to contact each other.

Correct Answer
verified

How does a phage transfer DNA from one bacterium to another?

Correct Answer
verified

A colony of mice is treated with a nonvirulent strain of the bacterium Streptococcus pneumoniae . Before treatment, a researcher exposed this nonvirulent strain to heat-killed cells of a virulent strain. What will be the effect on the mouse population?

Correct Answer
verified

Conjugation, transduction, and transformation are the three main mechanisms for gene transfer between bacteria. Compare these three mechanisms in terms of how DNA is transferred.

Correct Answer
verified
Conjugation involves the transfer of DNA...
View Answer

T-even bacteriophages ____.

Correct Answer
verified

The purpose of the sex pilus is to ____.

Correct Answer
verified

Hfr cells are bacterial cells that ____.

Correct Answer
verified

The core of a virus is a ____ molecule.

Correct Answer
verified

How do the constituents of liquid medium differ from solid, gel-like medium?

Correct Answer
verified

Match each of the following terms with its correct definition.

Prions ____.

Correct Answer
verified

Figure 17.1 Use the accompanying figure . If strains 1 and 2 conjugate and are plated on minimal medium, cells growing on the minimal medium will have the genotype ____.

Correct Answer
verified

Correct Answer
verified

The results of Lederberg and Tatum's experiments with E. coli auxotrophs indicated that ____.

Correct Answer
verified

The series of events from infection of a cell through the release of progeny phages from a lysed cell is called the ____ cycle.

Correct Answer
verified

Bacteria that undergo natural transformation ____.

Correct Answer
verified

Correct Answer
verified

Which statement correctly describes horizontal gene transfer?

Correct Answer
verified

Correct Answer
verified

Exam 17: Bacterial and Viral Genetics

Correct AnswerverifiedShow Answer

During bacterial conjugation, bacteria use a long tubular structure called a(n) ____ to contact each other.

Correct AnswerverifiedShow Answer

How does a phage transfer DNA from one bacterium to another?

Correct AnswerverifiedShow Answer

A colony of mice is treated with a nonvirulent strain of the bacterium Streptococcus pneumoniae . Before treatment, a researcher exposed this nonvirulent strain to heat-killed cells of a virulent strain. What will be the effect on the mouse population?

Correct AnswerverifiedShow Answer

Conjugation, transduction, and transformation are the three main mechanisms for gene transfer between bacteria. Compare these three mechanisms in terms of how DNA is transferred.

Correct AnswerverifiedConjugation involves the transfer of DNA...View AnswerShow Answer

T-even bacteriophages ____.

Correct AnswerverifiedShow Answer

The purpose of the sex pilus is to ____.

Correct AnswerverifiedShow Answer

Hfr cells are bacterial cells that ____.

Correct AnswerverifiedShow Answer

The core of a virus is a ____ molecule.

Correct AnswerverifiedShow Answer

How do the constituents of liquid medium differ from solid, gel-like medium?

Correct AnswerverifiedShow Answer

Match each of the following terms with its correct definition.

Prions ____.

Correct AnswerverifiedShow Answer

Figure 17.1 Use the accompanying figure . If strains 1 and 2 conjugate and are plated on minimal medium, cells growing on the minimal medium will have the genotype ____.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The results of Lederberg and Tatum's experiments with E. coli auxotrophs indicated that ____.

Correct AnswerverifiedShow Answer

The series of events from infection of a cell through the release of progeny phages from a lysed cell is called the ____ cycle.

Correct AnswerverifiedShow Answer

Bacteria that undergo natural transformation ____.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement correctly describes horizontal gene transfer?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
Conjugation involves the transfer of DNA...
View 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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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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Correct Answer
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Correct Answer
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