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%
E) It cannot be determined from the information provided.

Question

Quizplus · Accepted Answer

In DNA, the amount of cytosine (C) is equal to the amount of guanine (G), and the amount of adenine (A) is equal to the amount of thymine (T). If cytosine makes up 42%, then guanine also makes up 42%. This leaves 16% for adenine and thymine combined, so thymine would be 8%.

Cytosine Makes Up 42% of the Nucleotides in a Sample