Question

i need help with this one... this is a normal nucleotide sequence on a DNA strand:
A-C-T-G-G-A-T
what is an insertion?
A: A-C-TG-C-G-A-T
B:A-C-T-G-A-T
C:A-C-T-G-G-A-T
D:A-C-T-G-G-A-U

Answer 1

A: A-C-T-G-C-G-A-T is an insertion