alleryIn DNA, the complementary base pair to adenine (A) is:
AGuanine (G), paired with the bigger purine base on chain
BCytosine (C), the other pyrimidine in the helix structure
CUracil (U), the base used only in DNA double helix
DThymine (T), via two hydrogen bonds in DNA double helix
Answer & Solution
Correct answer: D. Thymine (T), via two hydrogen bonds in DNA double helix
**In DNA:** A-T pair via 2 H-bonds; G-C pair via 3 H-bonds.
(U replaces T in RNA only.)
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