Deck 22: Mobile DNA

Question 1

The of Tn21 family of transposons acts as a gene acquisition and expression system and has been implicated in the spread of antibiotic resistance.

A)IRS
B)integron
C)replicon
D)inverted repeats

Answer 1

B

Question 2

All transposons have all of the following characteristics except .

A)the gene for transposase
B)inverted repeats
C)resolvase
D)antibiotic resistance genes

Answer 2

D

Question 3

Where might mobile DNA elements be found?

A)plasmids
B)chromosomes
C)viral genomes
D)all of the above

Answer 3

D

Question 4

Reverse transcsriptase is needed for .

A)the movement of retrotransposons
B)the integration of RNA transposons
C)the transcription of RNA transposons
D)the excision of retrotransposons

Question 5

Internal resolution sites of complex transposons are recognized by .

A)Dicer
B)cointegrase
C)recombinase
D)resolvase

Question 6

Any DNA or RNA molecule that has an origin of replication is called a .

A)mobile element
B)transposon
C)replicon
D)integron

Question 7

What is the purpose of the inverted repeats at the ends of DNA-based transposons?

A)The inverted repeats are recognized by enzymes that move the elements.
B)The inverted repeats are the sites of transfer.
C)The inverted repeats are recognized by restriction enzymes that cut out the transposon.
D)The inverted repeats are magnets for nucleases.

Question 8

Conservative transposition .

A)generates a copy of the transposon
B)generates double-stranded breaks in the DNA
C)occurs only for RNA transposons
D)has no detrimental effects on the host genome.

Question 9

Defective copies of transposable elements that are found in genomes are called .

A)junk DNA
B)transposable elements
C)retrotransposons
D)introns

Question 10

Resolvase is needed for .

A)conservative transposition
B)replicative transposition
C)simple transposons
D)retrotransposons