Which base is unique to RNA and pairs with adenine?

In RNA, uracil is the base that is unique compared to DNA, where thymine serves a similar role. Uracil pairs with adenine during the process of transcription, forming base pairs that are essential for building RNA from the DNA template. This pairing is key for the synthesis of RNA molecules, which are vital for protein production and many cellular processes.

Uracil replaces thymine in RNA, which is significant because it helps to maintain the integrity and function of RNA in various biological roles, such as serving as the messenger and participating in the translation of genetic information into proteins.