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32 Gene regulation, continued

32 Gene regulation, continued. Lecture Outline 11/21/05. Review the operon concept Repressible operons (e.g. trp ) Inducible operons (e.g. lac ) Positive regulation of lac (CAP) Practice applying the operon concept to predict: the phenotypes of mutants

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This metabolic control occurs on two levels

Concept 18.4: Individual bacteria respond to environmental change by regulating their gene expression E. coli , a type of bacteria that lives in the human colon Can tune its metabolism to the changing environment and food sources. (a) Regulation of enzyme activity.

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Genetic Regulatory Mechanisms

Genetic Regulatory Mechanisms. Inducible Genes - Operon Model. Definition: Genes whose expression is turned on by the presence of some substance Lactose induces expression of the lac genes Catabolic pathways. Absence of lactose. z. y. a. i. p. o. Active. No lac mRNA.

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32 Gene regulation, continued

This metabolic control occurs on two levels

Genetic Regulatory Mechanisms