Discussion
The complementary base pairs among four nucleotides (A, T, G, C) are as
Answer: C
The complementary base pairs in DNA are A with T, held by two hydrogen bonds, and G with C, held by three. The booklet marks the three-bond pair with the sign of identity, so the correct choice reads A = T and G ≡ C.
The first choice pairs A with G, both purines, and T with C, both pyrimidines, which cannot be complementary. The second pairs A with C and G with T, which do not match in size or hydrogen bonding. 'All of the above' cannot be right when two of the three are wrong. In DNA the pairing is the reason that the two strands copy each other exactly, and it is the basis of DNA profiling.
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