If 15% of the nitrogenous bases in a sample of DNA from a particular organism is thymine,what percentage should be cytosine?
A) 15%
B) 30%
C) 35%
D) 40%
E) 70%

Question

Quizplus · Accepted Answer

In DNA, the amount of thymine always equals the amount of adenine, and the amount of cytosine always equals the amount of guanine. Therefore, if 15% of the bases are thymine, then 15% of the bases are also adenine. That leaves 70% of the bases to be split between cytosine and guanine. Since cytosine and guanine are always equal, each must be 35% to add up to 70%.

If 15% of the Nitrogenous Bases in a Sample of DNA