Which base replaces thymine in RNA and bonds with adenine?

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Multiple Choice

Which base replaces thymine in RNA and bonds with adenine?

Explanation:
In RNA, thymine is replaced by uracil, which pairs with adenine. Uracil serves the same pairing role as thymine in DNA, forming two hydrogen bonds with adenine to help stabilize the RNA structure during processes like transcription. Uracil is used in RNA specifically, whereas thymine is characteristic of DNA. Cytosine pairs with guanine, not adenine, so it doesn’t bond with adenine. Adenine can pair with thymine in DNA, but in RNA the pairing partner is uracil.

In RNA, thymine is replaced by uracil, which pairs with adenine. Uracil serves the same pairing role as thymine in DNA, forming two hydrogen bonds with adenine to help stabilize the RNA structure during processes like transcription. Uracil is used in RNA specifically, whereas thymine is characteristic of DNA. Cytosine pairs with guanine, not adenine, so it doesn’t bond with adenine. Adenine can pair with thymine in DNA, but in RNA the pairing partner is uracil.

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