Question

In the presence of lactase, lactose breaks down into molecules of

• A. Glucose and galactose
• B. Glucose and fructose
• C. Galactose only
• D. Glucose only

Answer 1

The correct option is A Glucose and galactose

Lactose is a disaccharide sugar derived from galactose and glucose that is found in milk. Lactase is an enzyme produced by many organisms. It is located in the brush border of the small intestine of humans and other mammals. Lactase is essential to the complete digestion of whole milk. Lactase breaks down lactose, a sugar which gives milk its sweetness. Lacking lactase, a person consuming dairy products may experience the symptoms of lactose intolerance. In metabolism, the β-glycosidic bond in D-lactose is hydrolyzed to form D-galactose and D-glucose, which can be absorbed through the intestinal walls and into the bloodstream. So, lactase breaks down the lactose into glucose and galactose as it is made of them. Thus, option A is correct.