The operon segment composed of the gene that codes for a protein repressor is called the

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The segment of the operon that contains the gene for a protein repressor is called the regulator. This gene codes for a protein that can bind to the operator, preventing RNA polymerase from transcribing the genes in the structural locus (the genes that code for proteins with a specific function). The promoter is the site where RNA polymerase binds to initiate transcription, and the operator is the segment of DNA adjacent to the promoter that the repressor protein can bind to. Therefore, the best choice is C, regulator.

The Operon Segment Composed of the Gene That Codes for a Protein