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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The hydrolysis of the glycosidic bond in a disaccharide is typically catalyzed by enzymes that are highly specific. For example, the enzyme that specifically hydrolyzes the β-1,4 bond of lactose is

A. Lactase (β-galactosidase)
✓
B. Sucrase
C. Maltase
D. Cellulase

📝 Explanation

The enzyme lactase (a β-galactosidase) is specific for the β-configuration of the galactose residue and the 1,4 linkage to glucose. Sucrase acts on the α,β-1,2 linkage of sucrose, and maltase acts on the α-1,4 linkage of maltose.

📖 Additional Information

  • Lactase (β-galactosidase)
  • Sucrase
  • Maltase
  • Cellulase

The enzyme lactase (a β-galactosidase) is specific for the β-configuration of the galactose residue and the 1,4 linkage to glucose. Sucrase acts on the α,β-1,2 linkage of sucrose, and maltase acts on the α-1,4 linkage of maltose.

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