試題詳解

5. Which of the following statements about transposon   are   correct?
(A) Transposon is a DNA sequence that can irreversibly change its position within a genome.
(B) Transposition often results in duplication of the same genetic material.
(C) The reverse transcription step of retrotransposon is catalyzed by a reverse transcriptase, which is often encoded by the transposon itself.
(D) Dissociation elements (Ds) is an example of an autonomous transposon, and activator element (Ac) is an example of a non-autonomous transposon. Without Ds, Ac is not able to transpose.
(E) Transposition of Ds was sometimes accompanied by major chromosomal rearrangements including deletions, duplications, inversions, reciprocal translocations.