Question

Enzymes synthesised in lac operon model are

• A. Lactase, galactose and hexokinase
• B. Permease, galactose and lactase
• C. Lactase, permease and galactosidase
• D. Permease, galactosidase and transacetylase

Answer 1

The correct option is D Permease, galactosidase and transacetylase

The lac operon is an operon responsible for transport and metabolism of lactose in Escherichia coli and other bacteria. It has three structural genes. The lac Z gene codes for $\beta$-galactosidase which converts lactose into glucose and galactose. The lac Y gene that codes for $\beta$-galactoside permease which transports lactose into the cell. The lac A gene codes for $\beta$-galactoside transacetylase. Option D is correct answer.