DNA replication begins with the separation of base pairs that have only two hydrogen bonds. Which base pairing is this?

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Multiple Choice

DNA replication begins with the separation of base pairs that have only two hydrogen bonds. Which base pairing is this?

Explanation:
Hydrogen bonds between bases hold the two DNA strands together, and replication starts by pulling those strands apart. Adenine pairs with thymine using two hydrogen bonds, while cytosine pairs with guanine with three hydrogen bonds. Since the question points to base pairs that separate with only two hydrogen bonds, the correct pairing is adenine with thymine. This pairing is also the standard Watson-Cick pairing that keeps the DNA helix evenly shaped. The other options either involve three bonds (cytosine–guanine) or are not the typical complementary pairs.

Hydrogen bonds between bases hold the two DNA strands together, and replication starts by pulling those strands apart. Adenine pairs with thymine using two hydrogen bonds, while cytosine pairs with guanine with three hydrogen bonds. Since the question points to base pairs that separate with only two hydrogen bonds, the correct pairing is adenine with thymine. This pairing is also the standard Watson-Cick pairing that keeps the DNA helix evenly shaped. The other options either involve three bonds (cytosine–guanine) or are not the typical complementary pairs.

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