Question

Which types of DNA sequences are typically found in an insertion element?

A. Long terminal repeats at both ends
B. Direct repeats at both ends
C. Coding region for a transposase enzyme
D. Antibiotic-resistance gene
E. Inverted repeats at both ends

Answer 1

Insertion elements typically contain inverted repeats at both ends and a coding region for a transposase enzyme; direct repeats are not part of the transposon itself but flank it as a result of the transposition process.

Step-by-step explanation:

The types of DNA sequences typically found in an insertion element include inverted repeats at both ends and a coding region for a transposase enzyme.

These inverted repeats are crucial for the transposon's ability to excise itself from one location in a genome and insert itself into another.

Members of the IS element family contain transposase and resolvase genes, and are flanked by inverted repeats. The transposons themselves are not the direct repeats; rather, they are flanked by direct repeats of host genome or plasmid DNA as a result of the transposition process.