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Grade: 12th pass

                        

In the function of the lac operon in e coli the lac genes z, y, a are transcribed in the presence of lactose because

6 months ago

Answers : (2)

NARASIMHAN
15 Points
							
Lactose (allolactose) is the inducer which stop the repressor molucule from binding to the operator site by changing its structure . As the operator is free from any kind of repressor molecule it allows the transcription of the lac z , lac y and lac a gene . The final products of lac z gene is β-galactosidase ,  lac y gene is Beta-galactoside permease and lac a gene is β-galactoside transacetylase which help in assimilation of lactose by the cell .
6 months ago
Arun
24742 Points
							
It normally blocks transcription of the operon, but stops acting as a repressor when lactose is present. The lac repressor senses lactose indirectly, through its isomer allolactose. Catabolite activator protein (CAP) acts as a glucose sensor.
6 months ago
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