Describe the functions of amylase, maltase, protease and lipase, listing the substrates and end-products, limited to: (a) amylase breaks down starch to maltose (b) maltase breaks down maltose to glucose (c) protease (pepsin and trypsin) breaks down protein to amino acids (d) lipase breaks down lipids to fatty acids and glycerol

Explain enzyme action with reference to the substrate, active site, enzyme-substrate complex, and product