Thymine makes up 28% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be guanine?
A) 8%
B) 16%
C) 22%
D) 72%

Question

Quizplus · Accepted Answer

According to Chargaff's rules, the amount of guanine in a DNA sample is equal to the amount of cytosine. Since thymine makes up 28% of the nucleotides, adenine will also make up 28%. Therefore, the remaining 44% of the nucleotides must be guanine and cytosine, which means that guanine will make up approximately 22% of the nucleotides in the sample.

Thymine Makes Up 28% of the Nucleotides in a Sample