How many hydrogen bonds form between adenine and thymine?

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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 adenine and thymine?

Explanation:
Base pairing in DNA is driven by hydrogen bonding between complementary bases. Adenine pairs with thymine through two hydrogen bonds, formed by specific donors and acceptors on each base arranged to fit together. This two-bond arrangement provides enough stability to hold the two DNA strands together while still allowing them to unzip for replication. One hydrogen bond would be too weak to keep the strands reliably paired, three occur in cytosine–guanine pairs, and four would not fit the chemical geometry of A–T pairing.

Base pairing in DNA is driven by hydrogen bonding between complementary bases. Adenine pairs with thymine through two hydrogen bonds, formed by specific donors and acceptors on each base arranged to fit together. This two-bond arrangement provides enough stability to hold the two DNA strands together while still allowing them to unzip for replication. One hydrogen bond would be too weak to keep the strands reliably paired, three occur in cytosine–guanine pairs, and four would not fit the chemical geometry of A–T pairing.

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