GeneRegulation160-page4 - molecules attached to the...

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Gene Regulation - 4 When lactose is present in the cell, some lactose molecules attach to the repressor protein sitting on the operator region of the gene and remove the repressor. The promoter is now available and the genes that code for the three enzymes to digest lactose are transcribed. When the enzymes are synthesized, the lactose is degraded, including the lactose
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Unformatted text preview: molecules attached to the repressor. When lactose is no longer available to bind to the repressor protein, the repressor shuts down the promoter (by sitting back on the operator), which stops transcription. One view of the Lactose Operon...
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