In RNA, what nucleotide replaces thymine found in DNA?

In RNA, uracil is the nucleotide that replaces thymine, which is found in DNA. The key difference between RNA and DNA lies in their structure and composition. DNA contains the base thymine, while RNA substitutes thymine with uracil. This substitution is significant because it allows RNA to perform its various functions, including protein synthesis and regulation of gene expression.

Uracil pairs with adenine during the process of transcription, where a segment of DNA is copied into RNA. This pairing is crucial for accurately conveying genetic information from the DNA template to the RNA product. The use of uracil instead of thymine also influences the overall stability and structural properties of RNA.

In summary, the correct answer emphasizes the unique role of uracil in the RNA structure, differentiating it from DNA, where thymine is present.