Question

Direct repeats ____.

a)Are also called target-site duplications.
b)Are oriented in the same direction.
c)Are adjacent to both ends of any TE.
d)All of the above are true.

Answer 1

Direct repeats are sequences adjacent to both ends of any transposable element, oriented in the same direction, and are also known as target-site duplications, so the answer is d) All of the above are true.

Step-by-step explanation:

Direct repeats refer to sequences in DNA where a certain segment of the genome is repeated and the orientations of the repeats are in the same direction. Specifically, in the context of transposable elements (TEs), direct repeats are also known as target-site duplications because they are generated as a result of the mechanism by which the transposable element inserts into the genome. When a TE integrates into the DNA, direct repeats of the target site's sequence are created adjacent to both ends of the TE. Hence, the statement "Direct repeats" is indeed characterized by:

• Being also called target-site duplications.
• Being oriented in the same direction.
• Being adjacent to both ends of any TE.

Therefore, the correct answer is d) All of the above are true.