![]() The following equation shows the digestion of lactose. For example, a single molecule of the enzyme lactase can speed up the digestion of many many molecules of lactose.Ĥ. Thus, an enzyme molecule can be reused over and over. The products are released from the enzyme and the enzyme returns to its original state, so the enzyme is ready to act on another substrate molecule. Circle the active site in the lactase enzyme in the figure.Īn enzyme speeds up a chemical reaction which converts a substrate molecule or molecules to a product molecule or molecules. Notice that the name of the enzyme lactase was created by adding the suffix "–ase" to part of the name of the substrate lactose.ģ. For example, the substrate lactose binds to the active site of the enzyme lactase. Lactase and most other enzymes are proteins.Įach enzyme has an active site where a substrate molecule binds. The enzyme that speeds up the digestion of lactose is called lactase. The digestion of the disaccharide lactose to the monosaccharides glucose and galactose occurs very very slowly unless there is an enzyme to speed up the process. When a sucrose molecule is digested, which monosaccharides are produced? Each disaccharide molecule must be broken down or digested into its monosaccharide components before it can be absorbed into the blood.Ģ. Monosaccharides from the food you eat are absorbed from your gut into your blood and carried to all the cells in your body where they are used for energy. ![]() The food you eat contains many different types of molecules, including two types of sugar molecules: monosaccharides and disaccharides.ġ.
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