Lactose is a disaccharide molecule, which means it is formed
by two different simple sugar molecules bonded together; those molecules are
glucose and galactose. The body can extract energy from lactose, so it uses an
enzyme called lactase to break lactose into two monosaccharides: glucose and
galactose.
We can conclude that after lactase breaks down a sugar in
milk, the monosaccharides formed in that reaction are glucose and galactose.
