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Why is uracil only in RNA and thymine only in DNA? (mod 2 topic 3)Uracil can be formed by a cystosine deamination so if uracil were normally in DNA then both spontaneous cytosine deamination and naturally occurring uracil would be indistinguishable and GC to A-T mutation build up quicklyuracil base pair with adenine and that can lead to G-C to A-T mutation so cannot have both uracil and adenine in DNA because then blank cannot base pair with adenineuracil does normally occur in both DNA and RNA and base pairs with adenine or thymine but enzymes remove uracil all of the time and replace it with thymineuracil use ribose sugar and thymine ursine deosyribose sugar so that prevents RNA and DNA from base pairing with each other uracil will then be eliminated from DNA

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