6) when dna is copied, sometimes a new, incorrect, base pairing appears within the structure of a new dna molecule replacing original base pairs. this mistake is called a base-pair a) deletion. b) insertion. c) institution. d) substitution.

D) substitution.

Explanation:

Substitution mutations are those in which one base pair is replaced by another base pair; they are called transition when substitution occurs between bases of the same class, purine to purine (A - G) and pyrimidine to pyrimidine (T - C); and transverse, when the substitution is between bases of different class, purine for pyrimidine and pyrimidine for purine.

hello there are no statements below!

prism b but im not for sure