A promoter is the specific region of a gene where RNA polymerase can bind and begin transcription.

A promoter is the specific region of a gene where RNA polymerase can bind and begin transcription.

• A. A region of a gene where transcription terminates.
• B. The specific region where RNA polymerase can bind and begin transcription.
• C. The coding region of a gene.
• D. A region that signals RNA processing.

Answer: (B)

Promoters are DNA sequences that control when and where transcription starts by providing a binding site for RNA polymerase and the necessary transcription factors. They’re typically located just upstream of the transcription start site and are not themselves copied into RNA. This makes them the signal that guides initiation of transcription. The other options describe different regions or signals: a termination signal marks where transcription ends; the coding region is the portion that gets transcribed (and often translated); RNA processing signals direct events like splicing and polyadenylation after transcription.

Promoters are DNA sequences that control when and where transcription starts by providing a binding site for RNA polymerase and the necessary transcription factors. They’re typically located just upstream of the transcription start site and are not themselves copied into RNA. This makes them the signal that guides initiation of transcription.

The other options describe different regions or signals: a termination signal marks where transcription ends; the coding region is the portion that gets transcribed (and often translated); RNA processing signals direct events like splicing and polyadenylation after transcription.