Question

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

Answer 1

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.