Discuss the biochemical and biological aspects of proteins. Discuss how proteins are classed as chemical catalysts. Discuss how catalysts work by chemically and physically binding to substrate molecules. Show digestive enzymes as an example. Indicate how hydrolysis of starch will occur when placed in solution and left for 48 hrs, but that in the presence of specific enzymes, the hydrolysis will occur in a few hours. Show how the substrate and the enzyme "fit" into each other and increase the hydrolysis reaction. Discuss also how proteins work as communicators, like insulin and growth hormone. Discuss the importance of proteins in the proper development of cells, hair, nails and bone.