Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism.Approximately what percentage of the nucleotides in this sample will be thymine?
A)8%
B)16%
C)31%
D)42%

Question

Quizplus · Accepted Answer

In DNA, the amount of cytosine (C) equals the amount of guanine (G), and the amount of adenine (A) equals the amount of thymine (T). If cytosine is 42%, guanine is also 42%, making up 84% of the DNA. The remaining 16% must be split equally between adenine and thymine, so thymine is 8%.

Cytosine Makes Up 42% of the Nucleotides in a Sample