Final answer:
The terminator sequence signals the end of transcription, following initiation at the promoter sequence and elongation of the mRNA strand.
Step-by-step explanation:
The sequence that signals the end of transcription is called the terminator. Transcription of DNA into mRNA occurs in three main stages: initiation, elongation, and termination. The process begins at a specific DNA sequence called a promoter, which signals the start of transcription and is where RNA polymerase binds to initiate the process. The elongation stage is where the mRNA strand is synthesized. Finally, termination of transcription occurs when RNA polymerase reaches a terminator sequence, signaling it to detach from the DNA and release the newly synthesized RNA molecule. This terminator sequence functions as a stop signal for transcription. Without it, RNA polymerase would continue transcribing, resulting in a transcript that goes beyond the intended end of the gene.