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Unformatted text preview: b. Repress (inhibit) enzyme production in the absence of the substrate 3. Operon consists of: a. Regulator gene codes for repressor protein b. Operator gene binding site for repressor protein c. Promoter gene binding site for RNA polymerase 4. Lac operon a. In absence of lactose: 1). Repressor protein binds to operator gene 2). RNA polymerase cannot bind to promoter gene 3). Production (transcription) of enzymes required for lactose metabolism prevented b. In presence of lactose: 1). Lactose molecules bind to repressor protein inactivated 2). Inactive repressor protein cannot bind to operator gene 3). RNA polymerase binds to promoter gene transcription 4). Production enzymes required for lactose metabolism 4. See operation of Lac operon in figure in text...
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- Fall '09