Question

Match the enzyme in column I with its function in column II and choose the correct option.

Column - I	Column - II
A. $\beta$ -galactosidase	1. Joining of DNA fragments
B. Permease	2. Peptide bond formation
C. Ligase	3. Hydrolysis of lactose
D. Ribozyme	4. Increases permeability to $\beta$ -galactosidase

• A. (A) -(2) , (B) - (1), (C) - (4), (D) -(3)
• B. (A) - (3) , (B) - (2), (C) - (1), (D) - (4)
• C. (A) - (2) , (B) - (4), (C) - (4), (D) -(3)
• D. (A) - (1) , (B) - (2), (C) - (4), (D) - (3)

Answer 1

Answer: (B)

$\beta -$ gal, coded by Z structural gene is primarily responsible for the hydrolysis of the disaccharide lactose into its monomeric units, galactose and glucose.
Ligase is also called the molecular glue. It joins DNA fragments.
Permease is a membrane transport protein which allows increases the permeability of beta galactosidase across the membrane.
Ribozymes are RNA molecules which act as enzymes which is involved in peptide bond formation.