... polypeptide segments. There are two basic types of proteases, the endopeptidases and the exopeptidases. Trypsin is an endopeptidase that is found in the alimentary canal of nearly all invertebrates and vertebrates organisms that digest in this way. It is specific for digestion of peptides and esters of the amino acids lysine and arginine. The enzyme attacks bonds located deep within the substrate protein, thus transforming large peptide chains into shorter polypeptide segments. Powdered milk (Marvel milk) contains a white phosphoprotein called casein. It is found in milk as a suspension of particles called micellae, which are held together by calcium ions. When the enzyme, trypsin, is added to its substrate, the amino acid chains that are located in the protein; casein, will be broken down and white opaque suspension becomes translucent. Prediction I predict that at low temperatures the reaction will take place relatively slowly. At lower temperatures, the molecules will ...

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