Which base pairs with adenine in RNA?

In RNA, adenine pairs with uracil. This is a fundamental aspect of the structure of RNA, which differs from DNA. In DNA, adenine pairs with thymine; however, in RNA, thymine is replaced by uracil. This substitution is significant as it not only allows RNA to perform its various roles in protein synthesis and gene expression, but it also contributes to the unique structural properties of RNA. The pairing between adenine and uracil is stabilized by hydrogen bonds, ensuring the proper formation of RNA molecules for their biological functions. Understanding this pairing helps clarify the differences between DNA and RNA base pairing processes, which is crucial for grasping molecular biology concepts.