Question

Lactose is a disaccharide of :

• A. $\alpha -D$-Glucose and $\alpha -D$-Fructose
• B. $\beta -D$-Glucose and $\beta -D$-Galactose
• C. $\alpha -D$-Glucose and $\beta -D$-Ribose
• D. $\alpha -D$-Glucose and $\alpha -D$-Galactose

Answer 1

The correct option is B $\beta -D$-Glucose and $\beta -D$-Galactose

Lactose is a disaccharide of $\beta -D$ galactopyranose and $\beta -D$ glucopyranose.

Option B is correct.