Question

The substitution, addition, or removal of a single nucleotide in DNA is called a(n) ____________ mutation.
A)interstitial
B)normal
C)point
D)reference

Answer 1

C

Answer 2

I don't think the other 3 exist in biological terms, though I have heard of interstitial voids before.

Answer 3

I would say point

Answer 4

Think of it this way, a deletion, addition, or substitution of a single nucleotide is the changing of a single point in the DNA code, thus the name of point mutation.