Question

Mention the function of the promoter gene in transcription.

Answer 1

The promoter is a specific DNA sequence located at the 5’ end (upstream) of the structural gene. Its primary functions in transcription are:

1. Binding Site for RNA Polymerase: It acts as the primary landing pad or recognition site where the enzyme RNA polymerase binds to initiate the transcription process.
2. Determining the Template Strand: By its specific orientation, the promoter defines which of the two DNA strands will serve as the template strand (3’ → 5’) and which will be the coding strand.
3. Start Point Selection: It precisely identifies the exact nucleotide where transcription should begin, ensuring that the genetic message is copied from the correct starting position.