Hello, I'm Stella Metsovas and today, we're discussing what do starch and glycogen have in common. First, let's discuss starches. Starches are glucose polymers and what that means is they are composed of many different molecules. Fun little fact: in the Greek language, actually my native language, poly means many. Enzymes called amylase digest starches. Humans and other animals have amylases so they can digest starches. Potato, rice, sweet and corn are the most consumed sources of starches in the human diet. Glycogen is similar to starch, a glucose polymer in plants and is sometimes referred to as an animal starch. Now, glycogen is a storage of carbohydrates like starch and it serves us our major energy source with most of it being stored in our liver and muscle tissue. In carbohydrate chemistry, both starch and glycogen are polymers of alpha-glucose. Organisms use glucose as a precursor to the synthesis of several important substances.