Genes that are involved in turning on or turning off the transcription of a set of structural genes are called as

Polymorphic genes

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Operator genes

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Redundant genes

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Regulatory genes

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Solution

The correct option is C Operator genes
The operator is a DNA sequence present between the promoter region and the first coding gene. This operator region serves as a repressor protein binding site. The binding of the repressor at the operator region prevents the RNA polymerase from transcribing certain genes in the operon unit. Hence operon is turned off.

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