Which of the following sequences is an example of a point mutation of the DNA sequence -A-A-G-T-G-C- ? (What?)

Question

-A-A-A-T-G-C-
-A-A-G-U-G-C-
-G-T-A-G-A-A-C-
-A-A-G-G-T-C-

Answer 1

A point mutation is a a mutation affecting only one or very few nucleotides in a gene sequence. So out of those four choices, it would be where only one is affected. The first choice, (A-A-A-T-G-C) Is correct.