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Transcript
Are genes always being transcribed and translated? Gene Expression Gene expression for all genes falls into one of two categories. constitutive expression – 1. 1. 2. known as housekeeping genes induced expression – lac Operon lac - lactose operon – promoter gene 1 operator gene 2 gene 3 lac Operon Bacterial cells mainly use glucose as a source of energy. The lac operon is only turned (on or off?) when glucose is absent, but lactose is present. lac Operon Operon codes for three enzymes 1. b-galactosidase (lacZ gene) 2. permease (lacY gene) 3. transacetylase (lacA gene) lac Operon The lacI gene codes for a separate repressor protein. lac Operon repressor protein (lacI gene) binds to the prevents RNA polymerase from When do you want the repressor to bind / not bind to the operon? When lactose is absent: When lactose is present: lac Operon effector molecule – inducer – lac Operon Animation lac Operon Animation
