NEET Biology question

E. coli cells with a mutated Z gene of the Lac operon cannot grow in a medium containing only lactose as a source of energy because

(A)In the presence of glucose, E. coli cells do not utilise lactose
(B)They cannot transport lactose from the medium into the cell
(C)The Lac operon is constitutively active in these cells
(D)They cannot synthesise functional β-galactosidaseCorrect

Answer: (D)

Solution

The z-gene encodes the enzyme β-galactosidase, which hydrolyses lactose into glucose and galactose for use as an energy source; a mutation in the z-gene means no

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Question ID VK-120489