Question

Lactose is composed of:

• A. Glucose + Glucose
• B. Glucose + Fructose
• C. Fructose + Galactose
• D. Glucose + Galactose

Answer 1

The correct option is D Glucose + Galactose

Lactose is a disaccharide and is made up of glucose and galactose. It is found in milk and milk products. Glucose and galactose are joined together by a beta glycosidic bond to form lactose.


$\begin{array}{cc}\text{Disaccharides}& \text{Monomer units}\\ \text{Maltose}& \text{Glucose + Glucose}\\ \text{Lactose}& \text{Glucose + Galactose}\\ \text{Sucrose}& \text{Glucose + Fructose}\end{array}$