Question

question 3
lactose, a disaccharide, is made by combining these two compounds:

○ glucose and galactose

○ galactose and fructose

○ glucose and glucose

○ fructose and sucrose

Explanation:

Lactose is a disaccharide formed by a glycosidic bond between glucose and galactose. Galactose and fructose form no common disaccharide here, glucose + glucose is maltose, and fructose + sucrose is incorrect (sucrose is a disaccharide itself, made of glucose and fructose). So the correct combination for lactose is glucose and galactose.

Answer:

A. glucose and galactose