Which enzyme is involved in the breakdown of lactose, and its deficiency leads to lactose intolerance, a condition characterized by bloating, gas, and diarrhea after consuming lactose-containing products?

A Lactate dehydrogenase
B Lactose phosphorylase
C Beta-galactosidase
D Lactase (beta-galactoside galactohydrolase) ✓

Explanation

Lactase is an enzyme that breaks down lactose into glucose and galactose. A deficiency in this enzyme leads to lactose intolerance, as the body is unable to digest lactose properly.

Mnemonic

LACT = Lactose Acts Through enzyme

Source

NCERT Class 12 Biochemistry
Enzymes in Disease Biochemistry Carbohydrate Metabolism Disorders Easy MEDICAL Confidence: high