Discussion
What is the term used for a segment of DNA with one or more genes in the centre and the two ends carrying inverted repeat sequences of nucleotides?
Answer: B
Correct answer: Transposon
A transposon is a segment of DNA carrying one or more genes flanked at both ends by inverted repeat sequences. The inverted repeats are the sites recognised by transposase, the enzyme that cuts the element out and inserts it elsewhere, and the central genes may include drug resistance or metabolic functions in addition to the transposase itself.
An insertion sequence also has terminal inverted repeats but carries only the transposase gene and no additional genes, which is exactly what the phrase "one or more genes in the centre" excludes. A plasmid is a separate replicating DNA molecule, not a mobile segment defined by inverted repeats.
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