Adenine pairs with which base in DNA?

Study for DNA History, Replication, and Protein Synthesis Test. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Master your exam content!

Multiple Choice

Adenine pairs with which base in DNA?

Explanation:
Base pairing in DNA is specific: adenine pairs with thymine, while cytosine pairs with guanine. This fit comes from the shapes of the bases and hydrogen bonding, which keeps the DNA double helix uniform in width. Adenine forms two hydrogen bonds with thymine, creating a stable pair that is reliably copied during replication. Uracil serves in RNA in place of thymine, pairing with adenine there, but in DNA the partner for adenine is thymine.

Base pairing in DNA is specific: adenine pairs with thymine, while cytosine pairs with guanine. This fit comes from the shapes of the bases and hydrogen bonding, which keeps the DNA double helix uniform in width. Adenine forms two hydrogen bonds with thymine, creating a stable pair that is reliably copied during replication. Uracil serves in RNA in place of thymine, pairing with adenine there, but in DNA the partner for adenine is thymine.

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