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प्रश्न
How many hydrogen bonds link guanine and cytosine in the DNA double helix?
विकल्प
1 hydrogen bond
4 hydrogen bonds
2 hydrogen bonds
3 hydrogen bonds
MCQ
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उत्तर
Guanine (G) pairs with cytosine (C) through 3 hydrogen bonds. This is one more hydrogen bond than the A-T pairing (which has 2 hydrogen bonds). The greater number of hydrogen bonds between G and C makes these regions of DNA slightly more stable, which has implications for DNA melting temperature and stability.
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