alleryNumber of H-bonds in A-T vs G-C base pair:
ABoth 2
B3 vs 2
C2 vs 3 (G≡C has 3 H-bonds, A=T has 2)
DBoth 3
Answer & Solution
Correct answer: C. 2 vs 3 (G≡C has 3 H-bonds, A=T has 2)
**A-T:** 2 H-bonds. G-C: 3 H-bonds. G-C pairs more stable.
DNA regions rich in G-C melt at higher T. Used in PCR primer design and genome analysis (e.g., AT-rich regions denature more easily).
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