Which base pairing is correct in DNA?

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Multiple Choice

Which base pairing is correct in DNA?

Explanation:
DNA base pairing follows a specific partner rule that keeps the double helix uniform: purines pair with pyrimidines. Adenine consistently pairs with thymine, forming two hydrogen bonds, which makes this a stable and standard DNA base pair. This pairing helps explain why Adenine with Thymine is correct in DNA. In addition, guanine pairs with cytosine, forming three hydrogen bonds, another stable DNA pairing. Uracil is used in RNA instead of thymine, so Adenine with Uracil wouldn’t be a DNA base pair. Pairing adenine with cytosine would disrupt the proper purine–pyrimidine fit.

DNA base pairing follows a specific partner rule that keeps the double helix uniform: purines pair with pyrimidines. Adenine consistently pairs with thymine, forming two hydrogen bonds, which makes this a stable and standard DNA base pair. This pairing helps explain why Adenine with Thymine is correct in DNA. In addition, guanine pairs with cytosine, forming three hydrogen bonds, another stable DNA pairing. Uracil is used in RNA instead of thymine, so Adenine with Uracil wouldn’t be a DNA base pair. Pairing adenine with cytosine would disrupt the proper purine–pyrimidine fit.

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