If a DNA sample were composed of 15% adenine,what would be the percentage of guanine?

Question

Quizplus · Accepted Answer

In DNA, adenine always pairs with thymine, and guanine always pairs with cytosine. Therefore, the percentage of guanine should be equal to the percentage of cytosine. Since adenine and thymine together account for 85% of the DNA sample (100% -15%), then guanine and cytosine must account for the remaining 15%. Since they are equally present, the percentage of guanine must also be 15%. However, we need to calculate the percentage of guanine alone, not together with cytosine. Therefore, we can infer that the percentage of guanine is equal to half the total amount of guanine-cytosine pairs, which is 30%. Therefore, the answer is C) 35%.

If a DNA Sample Were Composed of 15% Adenine,what Would