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LIFE 102 (201)

Transcription regulation, operons, differential gene regulation

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Life Science
LIFE 102
Louis Bjostad

18 AprilConcept 181 Bacteria often respond to environmental change by regulating transcriptionNatural selection has favored bacteria that produce only the products needed by that cellA cell can regulate the production of enzymes by feedback inhibition or by gene regulationGene expression in bacteria is controlled by the operon modelOperons The Basic ConceptA cluster of functionally related genes can be under coordinated control by a single onoff switchThe regulatory switch is a segment of DNA called an operator usually positioned within the promoterAn operon is the entire stretch of DNA that includes the operator the promoter and the genes that they controlThe operon can be switched off by a protein repressorThe repressor prevents gene transcription by binding to the operator and blocking RNA polymer
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