Starch and Cellulose are two examples of polysaccharides that are synthesized in plant cells and are used in heterotrophs to be digested, releasing glucose that is used in cellular respiration. However, unlike starch, animals need the assistance of some gut bacteria to digest cellulose and release glucose. Mention the difference between starch and cellulose that makes one digestible and the other indigestible, and how bacteria are able to digest cellulose, but animals cannot.