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Mechanism of Transposition

View the animation below, then complete the quiz to test your knowledge of the concept.

1The ends of a simple transposable element contain
A)genes for the transposase enzyme.
B)inverted repeats.
C)direct repeats.
D)self-replicating genes.
E)antibiotic-resistance genes.

2What is the difference between composite transposons and IS elements?
A)Composite transposons are found only in bacteria, while IS elements are found only in animals.
B)Composite transposons are DNA molecules, while IS elements are RNA.
C)Composite transposons can carry out their own transposition, while IS elements require help from other transposons.
D)Composite transposons can carry antibiotic resistance genes, while IS elements do not.
E)None of the above.

3The target sequence which is recognized by transposons
A)is made up of single-stranded DNA.
B)contains the sequence for the trasnsposase gene.
C)is cut out and discarded during transposition.
D)is duplicated during transposition.
E)is inverted during transposition.

4The enzyme transposase is highly specific, and so IS elements can only move to a few locations in the genome.

5A composite transposable element contains an IS element at each end.

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