NEETZoologyMolecular Basis of Inheritance
What is the function of the operator region in prokaryotic DNA?
Options
- ATo bind a repressor protein
- BTo bind a transcription factor
- CTo synthesize RNA polymerase
- DTo catalyze the hydrolysis of lactose
Correct answer
A. To bind a repressor protein
Step-by-step solution
In prokaryotes, control of the rate of transcriptional initiation is the predominant site for control of gene expression. In a transcription unit, the activity of RNA polymerase at a given promoter is in turn regulated by interaction with accessory proteins, which affect its ability to recognise start sites. These regulatory proteins can act both positively (activators) and negatively (repressors). The accessibility of promoter regions of prokaryotic DNA is in many cases regulated by the interaction of proteins wit