A sample of normal double-stranded DNA was found to have a guanine content of 18%.What is the expected proportion of adenine?

Question

Quizplus · Accepted Answer

Since DNA is double-stranded, the proportion of guanine (18%) will be equal to the proportion of cytosine, leaving a total of 64% (100-18-18-). That means AT content will be 36%, but this has to be shared between the two nucleotides. So, the expected proportion of adenine will be 32% (half of the AT content). Therefore, the correct answer is B.

A Sample of Normal Double-Stranded DNA Was Found to Have