AP Biologymediummcq1 pt
A double-stranded DNA sample contains 30% adenine. What percentage of its bases are guanine?
A.10%
B.30%
C.40%
D.20%
Explanation
Core Concept
For double-stranded DNA, adenine pairs with thymine and guanine pairs with cytosine. If A=30%, then T=30%; the remaining 40% is divided equally between G and C, so G=20%.
Correct Answer
D20%
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