LAC OPERON SYSTEM

1. Lac Operon

2. What is an operon?
 An operon is a cluster of genes transcribed at the
same time.
 They are mostly found in prokaryotes.
 An operon is made up of 3 basic DNA components
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a) Promoter
b) Operator
c) Structural genes

3. The lac operon:
 Lac operon consists of three genes each involved
in the processing of sugar lactose.
 It is an inducible operon.

4. Possible Four Scenarios:
 When lactose is absent but glucose is present
 When lactose and glucose both are absent
 When glucose is absent but lactose is present
 When glucose and lactose both are present

5. When lactose is absent, glucose is present :

6. When lactose and glucose both are absent:

7. When glucose is absent, lactose is
present:

8. When both glucose and lactose are
present:

9. Summary :

10. Thank you