DNA is composed of both A-T (adenine-thymine) pairs and G-C (guanine-cytosine) pairs, which form through complementary base pairing.
Which Pair is Stronger?
G-C pairs are stronger than A-T pairs because:
- G-C pairs form three hydrogen bonds, whereas
- A-T pairs form only two hydrogen bonds.
Since more hydrogen bonds mean greater stability, G-C-rich regions of DNA are more resistant to heat and denaturation than A-T-rich regions. This is why organisms living in extreme environments often have DNA with a higher G-C content for extra stability.
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