Question

A base sequence signalling the start of a gene is a ______.

Options

• activator protein

• operator

• enhancer

• promoter

Answer 1

A base sequence signalling the start of a gene is a promoter.

Explanation:

A promoter is a specific DNA sequence located just upstream of a gene that acts as a “start signal” for transcription. It provides the binding site for RNA polymerase and necessary transcription factors, ensuring the enzyme is correctly positioned to begin synthesising RNA. While operators and enhancers regulate the rate of transcription, the promoter is the essential foundation where the process actually begins.