RNA transcription is the process by which a specific segment of DNA is copied into RNA. This occurs in the cell's nucleus, where the enzyme RNA polymerase binds to the DNA at a specific region called the promoter. The enzyme then unwinds the DNA strands and synthesizes a complementary strand of RNA using the DNA template. During transcription, the RNA molecule is formed by pairing the DNA bases with their complementary RNA bases: adenine (A) pairs with uracil (U), and cytosine (C) pairs with guanine (G). Once the RNA strand is synthesized, it undergoes processing before it can be translated into a protein, marking the first step in the flow of genetic information from DNA to RNA to protein.