The given figure shows lac operon and its functioning. Select the option which correctly labels A, B

Question

The given figure shows lac operon and its functioning. Select the option which correctly labels A, B, X, Y and Z.\

Professor PC Thomas Classes · Answer

(c): The lac operon consists of three structural genes (lac $z$, lac y, lac a). Lac $z$ codes for $\beta$-galactosidase which hydrolyses lactose to glucose and galactose. Lac y codes for permease, a membrane-bound protein constituent of the lactose transport system which increase permeability of the cell to $\beta$-galactosides. Lac a codes of thiogalactoside transacetylase, an enzyme of uncertain metabolic function.