MHT CET Medical202621 April 2026Evening ShiftBiologyMolecular Basis of InheritanceActual
In lactose operon of E. coli , what is the function of promoter?
Options
- ABinding of Gyrase enzyme
- BBinding of RNA polymerase
- CCodes for RNA polymerase
- DProcessing of mRNA
Correct answer
B. Binding of RNA polymerase
Step-by-step solution
In the lactose operon of E. coli , the promoter is a specific DNA sequence located upstream of the structural genes. Its primary function is to provide a binding site for RNA polymerase, which is the enzyme responsible for initiating the transcription of the operon into mRNA. Therefore, the promoter facilitates the binding of RNA polymerase. Answer: Binding of RNA polymerase