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The Lac Operon. Lactose = Galactose and Glucose Cells adapt to their environment by turning on and off genes. An operon is a cluster of bacterial genes.

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Presentation on theme: "The Lac Operon. Lactose = Galactose and Glucose Cells adapt to their environment by turning on and off genes. An operon is a cluster of bacterial genes."— Presentation transcript:

1 The Lac Operon

2 Lactose = Galactose and Glucose

3 Cells adapt to their environment by turning on and off genes. An operon is a cluster of bacterial genes + adjacent promoter that controls the transcription of those genes.

4 A promoter = doorknob. It is kin to other operons. An operator is like the keyhole in a doorknob that is only unlocked by a specific key. specific key= regulatory protein.

5

6 NO LACTOSE

7 Lactose Present

8 When the enzymes produced, they break down lactose and allolactose, then release the repressor to stop transcription.

9 E. Coli prefer glucose

10 When both glucose and lactose, genes for lactose metabolism are transcribed to a small extent.

11 Maximal transcription occurs only when glucose is absent and lactose is present. The action of cyclic AMP and a catabolite activator protein produce this effect.

12 a permease that transports lactose across the membrane beta-galactosidase which hydrolyzes lactose into glucose and galactose. a transacetylase ????? uncertain.


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