Chargaff showed that DNA with 60% adenine and thymine has ___ guanine and cytosine.
A) 10%
B) 20%
C) 25%
D) 40%
E) 60%

Question

Quizplus · Accepted Answer

Chargaff's rule states that the amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine in a DNA molecule. Therefore, if a DNA molecule has 60% adenine and thymine, it must have 40% guanine and cytosine. Thus, the answer is D (40%).

Chargaff Showed That DNA with 60% Adenine and Thymine Has