Question

A regulatory gene produces some kind of protein through its mRNA that controls the activity of the operator gene which signals the formation of specific enzymes required for the metabolic breakdown of the food. How does that protein regulate the activity of the operator gene?

• A. The repressor protein produced after combining with an inducer activates the operator gene
• B. The repressor protein produced after combining with a co repressor activates the operator gene
• C. The catabolic activator protein(CAP) produced activates the operator gene
• D. The mutated repressor protein produced activates the operator gene

Answer 1

The correct option is D The mutated repressor protein produced activates the operator gene

when repressor not able to block operator gene ,operator gene remain functional.active protein produced by regulator gene act on E.coli operon system.so correct option is D