What base pairs with Guanine in DNA?

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Multiple Choice

What base pairs with Guanine in DNA?

Explanation:
Base pairing rules in DNA determine that guanine pairs with cytosine. Guanine is a purine and cytosine is a pyrimidine, so they fit together with a uniform helix width, and they form three hydrogen bonds. That extra bond adds stability to GC-rich regions of the DNA double helix. In contrast, thymine pairs with adenine in DNA using two hydrogen bonds, and uracil is used in RNA in place of thymine and pairs with adenine there. So the partner for guanine in DNA is cytosine.

Base pairing rules in DNA determine that guanine pairs with cytosine. Guanine is a purine and cytosine is a pyrimidine, so they fit together with a uniform helix width, and they form three hydrogen bonds. That extra bond adds stability to GC-rich regions of the DNA double helix. In contrast, thymine pairs with adenine in DNA using two hydrogen bonds, and uracil is used in RNA in place of thymine and pairs with adenine there. So the partner for guanine in DNA is cytosine.

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