At the basal surface of epithelial cells are located: 1  The basement membrane, a thin non-cellular layer, intervenes between the epithelium and the connective tissue. 2  Hemidesmosomes are a variant of the intercellular desmosomes and anchor the cell to the basement membrane.t the basal surface of epithelial cells are located: 1  The basement membrane, a thin non-cellular layer, intervenes between the epithelium and the connective tissue. 2  Hemidesmosomes are a variant of the intercellular desmosomes and anchor the cell to the basement membrane.
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. The enzyme that speeds up the digestion of lactose is called lactase. Lactase and most other enzymes are proteins.Each enzyme has an active site where a substrate molecule binds. For example, the substrate lactose binds to the active site of the enzyme lactase. Notice that the name of the enzyme lactase was created by adding the suffix â ase to part of the name of the substrate lactose.n enzyme speeds up a chemical reaction which converts a substrate molecule or molecules to a. product molecule or molecules. 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.
An enzyme called amylase, found in the saliva, starts the breakdown of sucrose. You swallow and the food travels through the esophagus to the stomach, where the food is mixed with hydrochloric acid, but very little digestion of sugars occurs.The primary site of sucrose digestion is next stop in the digestive tract -- the small intestine.he small intestine is lined with fingerlike projections called villi that are composed of epithelial cells. When dietary sucrose comes in contact with the villi, a hydrolase called sucrase breaks the sucrose molecule into glucose and fructose, which are then absorbed into the bloodstream and used by the body.