In DNA, the base pairing A-T and G-C reflects that
AA and G have the same molecular weight
BT and C pair freely as both are pyrimidines
CATP cannot be in DNA
DA-T = 2 H-bonds, G-C = 3, fits the helix
Answer & Solution
Correct answer: D. A-T = 2 H-bonds, G-C = 3, fits the helix
Base-pair geometry only works for A-T (2 H-bonds) and G-C (3 H-bonds). Other combinations have wrong shape or donor/acceptor patterns. Chargaff's rule (%A = %T, %G = %C) is the empirical confirmation. Molecular weight and pyrimidine class don't dictate pairing.
Related questions
In DNA, the complementary base pair to adenine (A) is:The disease scurvy results from deficiency of:In proteins, the peptide bond is best described as a:Glucose in open-chain form has a:An enzyme that requires a tightly bound non-protein helper (e.g., haem in catalase) needs A competitive inhibitor of an enzymeEnzymes speed up reactions byEach nucleotide in a nucleic acid contains