Background Information Note
Many sugars end in “-ose,” such as glucose, amylose or lactose. Enzymes usually end in “-ase,” like lactase or amylase.
Lactose Intolerance
Lactose is a sugar found in milk. Lactose intolerance occurs when an individual has a reduced ability to digest lactose due to not producing enough of the enzyme lactase. Because lactase is needed to process the lactose found in dairy products, low levels of this enzyme will make it difficult for the body to properly digest this sugar.
Figures
Figure 1

Look at the lactose molecule to the left of the arrow. Would this be classified as a monosaccharide or a disaccharide? How can you tell?
Lactose is a [monosaccharide/disaccharide]choose one because .