Which of the following are not associated to Lac Operon?
(A) Lysozyme
(B) β-galactosidase
(C) Chitinase
(D) Transacetylase
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A) and (C) only
The lac operon of E. coli has a regulatory gene i and three structural genes: z codes for β-galactosidase, y for permease and a for transacetylase.
(A) Lysozyme — Not associated. Lysozyme is used to break bacterial cell walls when DNA is isolated.
(B) β-galactosidase — Associated. Coded by z, it breaks lactose into galactose and glucose.
(C) Chitinase — Not associated. Chitinase is used to break fungal cell walls.
(D) Transacetylase — Associated. It is coded by the a gene of the operon.
NCERT Extract:
The Lac Operon – …
