How many hydrogen bonds form between guanine and cytosine?

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Study for the IMAT Biology Exam with focused multiple-choice questions. Use hints and explanations to enhance your preparation. Get ready for your exam success!

Multiple Choice

How many hydrogen bonds form between guanine and cytosine?

Explanation:
Hydrogen bonding between complementary bases is what holds the DNA double helix together. Guanine and cytosine pair with three hydrogen bonds, using the available donor and acceptor sites on each base to form three stabilizing interactions. This extra bond compared with other pairs makes GC pairs more stable, which is why DNA regions rich in GC have higher melting temperatures.

Hydrogen bonding between complementary bases is what holds the DNA double helix together. Guanine and cytosine pair with three hydrogen bonds, using the available donor and acceptor sites on each base to form three stabilizing interactions. This extra bond compared with other pairs makes GC pairs more stable, which is why DNA regions rich in GC have higher melting temperatures.

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