For the nucleoside shown, which row gives the name of the base and the number of hydrogen bonds it forms with its complementary base in double-stranded RNA?

AAdenine; 3
BGuanine; 3
CGuanine; 2
DAdenine; 2

Answer: D

The base is a fused six- and five-membered ring (purine) bearing an NH2 at C-6, which is adenine; the nucleoside is adenosine. In RNA adenine pairs with uracil through two hydrogen bonds (G-C pairs have three).

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