Identify the correct statement about the role of regulatory proteins in transcription in prokaryotes?

Options

A. The only increase expression
B. They only decrease expression
C. They interact with RNA polymerase but do not effect the expression
D. They can act both as activators and as repressors

Answer

D

Explanation

A regulatory gene is a gene involved in controlling the expression of one or more gene. It may code for repressor proteins that prevent RNA polymerase from transcribing RNA and other regulator genes code for activator proteins that binds to a site on the DNA molecule and causes an increase in transcription.