Question

During transcription, DNA site at which RNA polymerase binds is called

• A. Regulator
• B. Promoter
• C. Receptor
• D. Enhancer

Answer 1

The correct option is B Promoter

Promoter
1) The promoter site is located at the 5’end of the coding/non-template strand, upstream of the initiation codon of the structural gene of the transcription unit.
2) The promoter contains a sequence of nitrogenous bases that provide a site for the RNA polymerase to bind and initiate the process of transcription.


Receptor
Receptors are chemical structures made up of proteins that bind to specific ligands and help in transducing cellular signals.

Regulator
The regulator gene of an operon system, lies upstream of the promoter and outside the operon. It regulates the synthesis of a repressor molecule which binds to the operator gene of the operon to prevent transcription of the structural genes.

Enhancer
Enhancer sequences are short DNA sequences to which transcription factors bind to increase the likelihood of transcription of a specific gene.

Final answer
(A) Promoter