This is the normal nucleotide sequence on a dna strand: a-c-t-g-g-a-t what is a substitution?

(a.) a-c-t-g-c-g-a-t

(b.) a-c-t-g-a-t

(c.) a-g-t-g-g-a-t

(d.) a-c-u-g-g-a-u

The correct answer is -

(C.) A-G-T-G-G-A-T.

Substitution is a type of point mutation (a permanent change in the nucleotide sequence of DNA when one nucleotide base sequence is substituted by another base).

In this question, Cytosine (C) at second position is substituted by Guanine (G) only in option C).

Thus, option C) is the right answer.

a chair, a bed, and a toothbrush

explanation:

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs