In DNA and RNA, guanine forms 3 hydrogen bonds with _____.

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Multiple Choice

In DNA and RNA, guanine forms 3 hydrogen bonds with _____.

Explanation:
Guanine forms three hydrogen bonds with cytosine, giving this pair extra stability compared to other base pairs. The hydrogen-bonding pattern on G lines up with complementary sites on C so that three distinct hydrogen bonds can form between them. This is true in both DNA and RNA, where adenine pairs with thymine (or uracil in RNA) using two hydrogen bonds, while G–C uses three. The result is that GC-rich regions are more thermally stable due to those extra bonds.

Guanine forms three hydrogen bonds with cytosine, giving this pair extra stability compared to other base pairs. The hydrogen-bonding pattern on G lines up with complementary sites on C so that three distinct hydrogen bonds can form between them. This is true in both DNA and RNA, where adenine pairs with thymine (or uracil in RNA) using two hydrogen bonds, while G–C uses three. The result is that GC-rich regions are more thermally stable due to those extra bonds.

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