The bases of rna are the same as those of dna except that rna has uracil instead of adenine cytosine instead of quanine uracil instead of thymine cysteine instead of cytosine

RNA has Uracil instead of Thymine. All the other three bases also occurs in RNA, adenine, guanine and cytosine. Therefore a ATA DNA codon will be transcript to UAU by RNA. Both Thymine and Uracil have the same role in however have minor chemical differences.

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