Question 1

In maize,the Ac factor is not associated with

Accepted Answer

A)   structural identity between different Ac elements.
B)   the activator of chromosomal breakage in regions containing aberrant Ds.
C)   Cis-acting in its ability to transpose Ds.
D)   inverted terminal and direct repeats.
E)   None of theseF) B) and D)
G) B) and C)

Question 2

Which of the following pairs of DNA sequences could qualify as terminal repeats of IS elements? (read all sequences as 5' to 3')

Accepted Answer

A)   AATTCCGTG and AATTCCGTG
B)   TTCGTT and TTCGTT
C)   TGTGGCTTT and TTTCGGTGT
D)   TCTTGG and GGTTCT
E)   TATATA and ATATATF) B) and C)
G) All of the above

Question 3

Which of the following enzymes is responsible for the synthesis of DNA from RNA which is then inserted into the new position in retrotransposition?

Accepted Answer

A)   Transformase
B)   Transposase
C)   Reverse transcriptase
D)   Ligase
E)   HelicaseF) B) and C)
G) A) and B)

Question 4

Ds elements that contain non-Ac DNA between their inverted terminal repeats are known as

Accepted Answer

A)   aberrant Ds elements.
B)   unusual Ds elements.
C)   double Ds elements.
D)   aberrant Ds elements and Unusual Ds elements.
E)   All of theseF) A) and B)
G) None of the above A

Question 5

What is another name for Ac and Ds transposable elements,which emphasizes the effect on gene expression?

Accepted Answer

A)   Controsons
B)   Controlling elements
C)   Cosmids
D)   Controsons and controlling elements
E)   All of theseF) All of the above
G) B) and E) B

Question 6

Which of the following are encoded by the genes in Tn3 elements?

Accepted Answer

A)   Transposase
B)   Beta lacatamase
C)   Resolvase
D)   Transposase and Beta lacatamase
E)   All of theseF) A) and B)
G) A) and C)

Question 7

Cut and paste transposition can occur in which of the following organisms?

Accepted Answer

A)   C. elegans
B)   E. coli
C)   S. aureus
D)   E. coli and S. aureus
E)   All of theseF) A) and C)
G) C) and D)

Question 8

Which of the following is a transposable element found in the human genome?

Accepted Answer

A)   LINES
B)   SINES
C)   Retrovirus-like elements
D)   All of these
E)   None of theseF) B) and E)
G) A) and C)

Question 9

How does transposase act to catalyze transposition in IS elements?

Accepted Answer

At least some IS elements encode a prote...

Question 10

Which term is used to denote the syndrome produced from Drosophila crosses that gave rise to hybrids with an assortment of aberrant traits,including frequent mutation,chromosome breakage?

Accepted Answer

A)   Hybrid dysgenesis
B)   Hybrid displasia
C)   Hybrid polymorphism
D)   Hybrid dysgenesis and hybrid displasia
E)   All of theseF) A) and D)
G) A) and C)

Question 11

Which of the following statements is not true about L1 elements?

Accepted Answer

A)   L1 is the only transposable element known to be active in humans.
B)   L1 is unique to humans alone.
C)   L1 elements are heterogeneous in size and maintained in single copy in the human genome.
D)   L1 not is a retroposon.
E)   None of theseF) A) and E)
G) C) and D)

Question 12

How do IS elements of E.coli contribute to horizontal gene transfer?

Accepted Answer

IS elements are contained not only in th...

Question 13

What type of transposon is an IS element?

Accepted Answer

A)   Cut and paste transposon
B)   Replicative transposon
C)   Retrovirus-like transposon
D)   Retrotransposon
E)   All of theseF) A) and B)
G) All of the above A

Question 14

If two transposons,in the same chromosome and in opposite orientation,pair and cross over,the segment between them will be

Accepted Answer

A)   inverted.
B)   deleted.
C)   inactive.
D)   unchanged.
E)   None of theseF) A) and C)
G) A) and B)

Question 15

Which transposon(s) is responsible for leaving delta-sequences in the chromosome after transposition?

Accepted Answer

A)   Tn5
B)   Ty elements
C)   Mariner
D)   P elements
E)   RetroposonsF) All of the above
G) C) and D)

Question 16

Explain how transposable elements are responsible for chromosomal breakage in the maize Ac/Ds system as shown by McClintock.

Accepted Answer

The mechanism that McClintock proposed t...

Question 17

Which type of transposon is not found in prokaryotes?

Accepted Answer

A)   IS elements
B)   Composite transposons
C)   Tn3
D)   Tac
E)   All of these are found in prokaryotes.F) B) and D)
G) A) and C)

Question 18

Which of the following describes the category of transposons in which transposition is accomplished by excising an element from its position in a chromosome and inserting it into another position?

Accepted Answer

A)   Cut and paste transposons
B)   Replicative transposons
C)   Retrotransposons
D)   Cut and paste transposons and replicative transposons
E)   All of theseF) A) and B)
G) C) and D)

Question 19

How does the transposition of a Tn3 element occur?

Accepted Answer

The transposition of Tn3 occurs in two s...

Question 20

Which category of transposons accomplishes transposition through a process that involves the insertion of copies of an element that were synthesized from the element's RNA?

Accepted Answer

A)   Cut and paste transposons
B)   Replicative transposons
C)   Retrotransposons
D)   Cut and paste transposons and Replicative transposons
E)   All of theseF) All of the above
G) A) and E)

Exam 17: Transposable Genetics Elements

In maize,the Ac factor is not associated with

Correct AnswerverifiedShow Answer

Which of the following pairs of DNA sequences could qualify as terminal repeats of IS elements? (read all sequences as 5' to 3')

Correct AnswerverifiedShow Answer

Which of the following enzymes is responsible for the synthesis of DNA from RNA which is then inserted into the new position in retrotransposition?

Correct AnswerverifiedShow Answer

Ds elements that contain non-Ac DNA between their inverted terminal repeats are known as

Correct AnswerverifiedA

What is another name for Ac and Ds transposable elements,which emphasizes the effect on gene expression?

Correct AnswerverifiedB

Which of the following are encoded by the genes in Tn3 elements?

Correct AnswerverifiedShow Answer

Cut and paste transposition can occur in which of the following organisms?

Correct AnswerverifiedShow Answer

Which of the following is a transposable element found in the human genome?

Correct AnswerverifiedShow Answer

How does transposase act to catalyze transposition in IS elements?

Correct AnswerverifiedAt least some IS elements encode a prote...View AnswerShow Answer

Which term is used to denote the syndrome produced from Drosophila crosses that gave rise to hybrids with an assortment of aberrant traits,including frequent mutation,chromosome breakage?

Correct AnswerverifiedShow Answer

Which of the following statements is not true about L1 elements?

Correct AnswerverifiedShow Answer

How do IS elements of E.coli contribute to horizontal gene transfer?

Correct AnswerverifiedIS elements are contained not only in th...View AnswerShow Answer

What type of transposon is an IS element?

Correct AnswerverifiedA

If two transposons,in the same chromosome and in opposite orientation,pair and cross over,the segment between them will be

Correct AnswerverifiedShow Answer

Which transposon(s) is responsible for leaving delta-sequences in the chromosome after transposition?

Correct AnswerverifiedShow Answer

Explain how transposable elements are responsible for chromosomal breakage in the maize Ac/Ds system as shown by McClintock.

Correct AnswerverifiedThe mechanism that McClintock proposed t...View AnswerShow Answer

Which type of transposon is not found in prokaryotes?

Correct AnswerverifiedShow Answer

Which of the following describes the category of transposons in which transposition is accomplished by excising an element from its position in a chromosome and inserting it into another position?

Correct AnswerverifiedShow Answer

How does the transposition of a Tn3 element occur?

Correct AnswerverifiedThe transposition of Tn3 occurs in two s...View AnswerShow Answer

Which category of transposons accomplishes transposition through a process that involves the insertion of copies of an element that were synthesized from the element's RNA?

Correct AnswerverifiedShow Answer

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A

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B

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At least some IS elements encode a prote...
View Answer

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IS elements are contained not only in th...
View Answer

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A

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The mechanism that McClintock proposed t...
View Answer

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The transposition of Tn3 occurs in two s...
View Answer

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