Which bases pair together in DNA?

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Study for the Principles of Biology Exam 2. Enhance your understanding with multiple-choice questions, detailed explanations, and study tips. Ace your biology test!

Multiple Choice

Which bases pair together in DNA?

Explanation:
In DNA, bases pair specifically so the two strands fit together neatly. Adenine is a purine and thymine is a pyrimidine, and they form two hydrogen bonds that hold the strands together. This A–T pairing helps keep the helix width uniform. Uracil is the RNA base and isn’t used in DNA, so pairing involving uracil isn’t a DNA rule; cytosine pairs with guanine instead (three hydrogen bonds). So the pairing that occurs in DNA is adenine with thymine.

In DNA, bases pair specifically so the two strands fit together neatly. Adenine is a purine and thymine is a pyrimidine, and they form two hydrogen bonds that hold the strands together. This A–T pairing helps keep the helix width uniform. Uracil is the RNA base and isn’t used in DNA, so pairing involving uracil isn’t a DNA rule; cytosine pairs with guanine instead (three hydrogen bonds). So the pairing that occurs in DNA is adenine with thymine.

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