Which nitrogen base is never found in RNA?

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Multiple Choice

Which nitrogen base is never found in RNA?

Explanation:
RNA uses adenine, guanine, cytosine, and uracil, not thymine. Thymine is a DNA-specific base; its methyl group makes it more chemically stable for the long-term storage of genetic information and helps repair systems distinguish true thymine from uracil that can arise from cytosine deamination. In RNA, the cheaper and more transient uracil is used in place of thymine, pairing with adenine just as thymine would in DNA. This is why thymine is never found in RNA.

RNA uses adenine, guanine, cytosine, and uracil, not thymine. Thymine is a DNA-specific base; its methyl group makes it more chemically stable for the long-term storage of genetic information and helps repair systems distinguish true thymine from uracil that can arise from cytosine deamination. In RNA, the cheaper and more transient uracil is used in place of thymine, pairing with adenine just as thymine would in DNA. This is why thymine is never found in RNA.

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