Question

The transposase is encoded by sequence located__________ ?

1. Only within the LTRs= long terminal repeats
2. Between the ITRs =terminal inverted repeats
3. On the outside of direct repeats
4. Downstream from the recipient target sequence

Answer 1

2. Between the ITRs =terminal inverted repeats. The transposase is encoded by sequence located between the ITRs = terminal inverted repeats. Non-LTR retrotransposons, such as LINES, have genes flanked by 5' and 3' UTRs, rather than long terminal repeats (LTRs). The transposase is responsible for the integration of the retrotransposon at the target site.

Step-by-step explanation:

The transposase is encoded by sequence located between the ITRs = terminal inverted repeats. Non-LTR retrotransposons, such as LINES (Long Interspersed Nuclear Elements), have genes flanked by 5' and 3' UTRs, rather than long terminal repeats (LTRs). The transposase is encoded by the second gene (ORF2) in the 5' UTR and is responsible for the integration of the retrotransposon at the target site.