alleryA double-stranded DNA contains 20% cytosine. What percentage of adenine is present?
A30%
B20%
C40%
D60%
Answer & Solution
Correct answer: A. 30%
By Chargaff's rule, %C = %G = 20%, so C + G = 40%.
**Therefore A + T = 60%, and A = T = 30%.**
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