Which of the following is a major distinction between a transposon and a retrotransposon?
a) A retrotransposon always uses the copy-paste mechanism, while a transposon uses cut and paste mechanism.
b) A transposon is related to a virus and a retrotransposon is not.
c) A transposon moves via a DNA intermediate and a retrotransposon via an RNA intermediate.
d) A transposon always leaves a copy of itself at its original position and a retrotransposon does not.
e) The positioning of a transposon copy is transient while that of a retrotransposon is permanent.
Answer: c) A transposon moves via a DNA intermediate and a retrotransposon via an RNA intermediate.
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