Which base is unique to RNA among the four standard bases?

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Multiple Choice

Which base is unique to RNA among the four standard bases?

Explanation:
RNA uses uracil instead of thymine, so uracil is the base unique to RNA among the four standard bases. Adenine and guanine are found in both RNA and DNA, while thymine is specific to DNA. Structurally, uracil is like thymine but lacks the 5‑methyl group, which is why thymine is used in DNA. In RNA, adenine pairs with uracil, mirroring the A–T pairing in DNA but with U instead of T.

RNA uses uracil instead of thymine, so uracil is the base unique to RNA among the four standard bases. Adenine and guanine are found in both RNA and DNA, while thymine is specific to DNA. Structurally, uracil is like thymine but lacks the 5‑methyl group, which is why thymine is used in DNA. In RNA, adenine pairs with uracil, mirroring the A–T pairing in DNA but with U instead of T.

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