RNA transcription is the process by which a specific segment of DNA is copied into messenger RNA (mRNA). This occurs in the cell nucleus, where the enzyme RNA polymerase binds to the DNA at a specific region called the promoter. The RNA polymerase then unwinds the DNA strands and synthesizes a complementary strand of RNA by adding RNA nucleotides. Once the mRNA strand is formed, it undergoes several modifications, including the addition of a 5' cap and a poly-A tail, which help protect the mRNA and facilitate its export from the nucleus. The mature mRNA then travels to the ribosome, where it serves as a template for protein synthesis during the process of translation.