What is the sequence of structural gene by lac operon concept?

Lac A, Lac Y, Lac Z

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Lac A, Lac Z, Lac Y

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Lac Y, Lac Z, Lac A

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Lac Z, Lac Y, Lac A

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Solution

The correct option is D Lac Z, Lac Y, Lac A
The lac operon is an operon required for the transport and metabolism of lactose in E.coli and some other enteric bacteria. It has three adjacent structural genes, lac Z, lac Y and lac A. The genes encode beta galactosidase, lactose permease and thiogalactoside transacetylase, respectively.
So, the correct answer is 'Lac Z, Lac Y, Lac A'

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