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

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

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Grade:12th pass

2 Answers

NARASIMHAN
15 Points
4 years ago
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 .
Arun
25750 Points
3 years ago
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.

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