Question

If percentage of cytosine is 18%, what will be the percentage of adenine?

• A. 32%
• B. 64%
• C. 36%
• D. 23%

Answer 1

Answer: (A)

32%

If the percentage of cytosine is 18% the percentage of thymine will be 32%. Thus, Guanine also constitutes the same percentage as that of cytosine, that is 18%. Thus, the percentage of adenine is 32%. This follows Chargaff's rule:
A+G = C+T.

So, the correct answer is option A.