In DNA base pairing, which pair is correct?

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Multiple Choice

In DNA base pairing, which pair is correct?

Explanation:
Complementary base pairing in DNA relies on specific hydrogen bonds between bases so the two strands stay aligned and the helix has a uniform width. Adenine pairs with thymine because they form two hydrogen bonds, and cytosine pairs with guanine because they form three hydrogen bonds; this pairing pattern keeps the DNA ladder evenly spaced and allows accurate copying during replication. Uracil is used in RNA instead of thymine, so in DNA thymine is the partner for adenine, not uracil, and cytosine pairs with guanine.

Complementary base pairing in DNA relies on specific hydrogen bonds between bases so the two strands stay aligned and the helix has a uniform width. Adenine pairs with thymine because they form two hydrogen bonds, and cytosine pairs with guanine because they form three hydrogen bonds; this pairing pattern keeps the DNA ladder evenly spaced and allows accurate copying during replication. Uracil is used in RNA instead of thymine, so in DNA thymine is the partner for adenine, not uracil, and cytosine pairs with guanine.

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