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?

In DNA, the bases present undergo complementary pairing. The base pairs are as follows:

Adenine - Thymine

Cytosine - Guanine

So if the DNA sample has 28% Thymine, the amount of Adenine will be equal which will be 28%.

The remaining bases will occupy:

100 - 28 * 2 = 44%

Because Cytosine and Guanine will be in equal quantities,

Guanine = 44/2 = 22%