(A) The given figure represents the $lac$ operon model. In the $lac$ operon,the structural genes are $z$,$y$,and $a$. - The gene '$z$' codes for $\bet

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(A) The given figure represents the $lac$ operon model. In the $lac$ operon,the structural genes are $z$,$y$,and $a$. - The gene '$z$' codes for $\beta$-galactosidase $(2)$. - The gene '$y$' codes for permease $(3)$. - The gene '$a$' codes for transacetylase $(4)$. Therefore,'$4$' represents transacetylase.