Question

The lac operon consists of (1)Four regulatory genes only (2)One regulatory gene and three structural genes (3)Two regulatory genes and two structural genes (4)Three regulatory genes and three structural genes

Answer 1

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(3)Two regulatory genes and two structural genes

The lac operon consists of 3 structural genes, and a promoter, a terminator, regulator, and an operator. The three structural genes are: lacZ, lacY, and lacA. lacZ encodes β-galactosidase (LacZ), an intracellular enzyme that cleaves the disaccharide lactose into glucose and galactose.

Answer 2

Answer:

Option 2) One regulatory genes and three structural genes is correct.