Explanation:
Exp: A
Uracil is present in RNA but not in DNA Uracil is one of the four nucleobases in the nucleic acid RNA. The others are adenine, cytosine and guanine. In RNA, uracil binds to adenine via two hydrogen bonds. In DNA, the uracil nucleobases is replaced by thymine. Uracil is a demethylated form of thymine.
Formula:- \(\mathrm{C}_{4} \mathrm{H}_{4} \mathrm{~N}_{2} \mathrm{O}_{2}\)