How does RNA know when it's reached the end of a gene?

RNA knows it has reached the end of a gene through specific signals in the DNA sequence, such as terminator regions. In prokaryotes, these signals can be distinct sequences that prompt the RNA polymerase to detach from the DNA. In eukaryotes, termination often involves additional factors and specific sequences that lead to the cleavage of the RNA transcript. These mechanisms ensure that the RNA synthesis stops accurately at the right point, allowing for proper gene expression.