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(B) In the $lac$-operon model,the structural genes are $z$,$y$,and $a$.$1$. The $z$ gene codes for $\beta$-galactosidase,which is responsible for the

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Permease

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(B) In the $lac$-operon model,the structural genes are $z$,$y$,and $a$.$1$. The $z$ gene codes for $\beta$-galactosidase,which is responsible for the hydrolysis of lactose into glucose and galactose.$2$. The $y$ gene codes for permease,which increases the permeability of the cell to $\beta$-galactosides like lactose.$3$. The $a$ gene codes for transacetylase,which transfers an acetyl group to $\beta$-galactosides.Therefore,the expression of the $y$ gene results in the production of permease.

Which enzyme is the expression product of the $y$ gene in the $lac$-operon?

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