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(A) In the operon model,the activity of structural genes is primarily controlled by the operator gene.An operator is a segment of $DNA$ to which a rep

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Operator

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(A) In the operon model,the activity of structural genes is primarily controlled by the operator gene.An operator is a segment of $DNA$ to which a repressor protein binds,thereby preventing the transcription of structural genes.The regulator gene produces the repressor protein,but the operator acts as the direct switch that controls the access of $RNA$ polymerase to the structural genes.

The activity of structural genes is controlled by.....

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