The chemical structure of uracil, showing its single-ring pyrimidine structure. Uracil forms hydrogen bonds with adenine in RNA, contributing to the molecule's structure and function. (Image: Public ...

Thus, in RNA, adenine pairs with uracil (A-U), and guanine pairs with cytosine (G-C). RNA plays a crucial role in the expression of genetic information, acting as a messenger (mRNA) that carries the ...