Question

This is the normal nucleotide sequence on a DNA strand:

A—C—T—G—G—A—T.


What is an insertion?



1. A—C—T—G—G—A—U



2. A—G—T—G—G—A—T




3. A—C—T—G—C—G—A—T



4. A—C—T—G—A—T

Answer 1

I am not sure, but I would say it is 3 since it's the only one that adds something to it. Forgive me if it's wrong