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Configurations of the lactose operon

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Description
a. Binding of the repressor to the operator inhibits transcription of the structural genes.
b. The inducer binds to the repressor, decreasing the affinity of the repressor for the operator.
Dissociation of the inactive repressor–inducer complex from the operator permits transcription of the structural genes.
The phenotypes of partial diploids involving lac regulatory genes gave indispensable clues to mechanisms of transcriptional regulation.
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