Question

In an operon model, regulator gene function as

• A. Repressor
• B. All of the above
• C. Inhibitor
• D. Regulator

Answer 1

Answer: (B)

Operon model contains a cluster of genes which are under the control of single promoter. It consists of an operator, promoter, regulator and structural genes. The regulator gene function as a repressor as it produces repressor protein that binds to the operator and thus inhibits the transcription of the structural genes. It functions as regulator as it regulates the transcription of structural gene. The product of regulator gene is inhibitor that keeps the operon model turned off.

Thus, the correct answer is option D.