The base composition in DNA isolated from cow liver cells is 28% adenine; what percent of the bases are cytosine?
A)14%
B)22%
C)28%
D)36%
E)56%

Question

Quizplus · Accepted Answer

In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). Since the amount of adenine is 28%, thymine will also be 28% because of base pairing rules. This accounts for 56% of the DNA bases, leaving 44% to be divided equally between cytosine and guanine. Therefore, cytosine makes up 22% of the bases.

The Base Composition in DNA Isolated from Cow Liver Cells