Which base pair forms two hydrogen bonds?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

Which base pair forms two hydrogen bonds?

Explanation:
Base pairing in DNA is guided by hydrogen bonds between complementary nucleotides. Adenine forms two hydrogen bonds with thymine, so this pair is the two-bond pairing that helps hold the DNA double helix together while still allowing separation during replication. Guanine–cytosine pair forms three hydrogen bonds, making it more stable. Pairs like adenine–cytosine or thymine–guanine don’t fit the standard Watson–Crick pairing rules. So, adenine and thymine are the ones that form two hydrogen bonds.

Base pairing in DNA is guided by hydrogen bonds between complementary nucleotides. Adenine forms two hydrogen bonds with thymine, so this pair is the two-bond pairing that helps hold the DNA double helix together while still allowing separation during replication. Guanine–cytosine pair forms three hydrogen bonds, making it more stable. Pairs like adenine–cytosine or thymine–guanine don’t fit the standard Watson–Crick pairing rules. So, adenine and thymine are the ones that form two hydrogen bonds.

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