In any sample of double-stranded DNA, _______ percent of the bases are purines.
A) 10
B) 25
C) 50
D) 100
E) The amount depends upon the organism from which the DNA came.

Question

Quizplus · Accepted Answer

In any sample of double-stranded DNA, the amount of purines is equal to the amount of pyrimidines. Since there are two types of purines (adenine and guanine) and two types of pyrimidines (cytosine and thymine), each group makes up 50% of the bases. Therefore, choice C is correct.

In Any Sample of Double-Stranded DNA, _______ Percent of the Bases