The gene of an operon that codes for a protein repressor is called the
A)Operator
B)Structural locus
C)Regulator
D)Promoter
E)None of the choices are correct

Question

Quizplus · Accepted Answer

The gene that codes for a protein repressor is called the regulator. It is responsible for producing the protein that can bind to the operator region and prevent transcription of the structural genes in the operon. The operator is the region of DNA where the repressor protein binds, the structural locus codes for the protein(s) produced by the operon, and the promoter is the region of DNA where RNA polymerase binds to initiate transcription. Therefore, the best choice is C, regulator.

The Gene of an Operon That Codes for a Protein