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Biology Coursework Enzymes Enzymes are a substance that acts as a catalyst in living organisms. Enzymes are found in the mouth, stomach and small intestine of mammals. There are many types of enzymes such as lipase and protease. Each different type of enzyme has its different type of food to speed up the reaction of its breakdown. Even after the enzyme has done its job, its structure still remains unchanged. Humans need enzymes to break down food into small molecules, small enough to be absorbed in the small intestine. Here are two examples of the substrate (food molecule), enzyme and its product. Amylase Starch --> Maltose Starch phosphorylase Glucose --> Starch Enzymes work like a lock and key, the key fits in and out but the lock remains the same. Substrate--> Enzyme--> Product--> All enzymes are proteins, and their molecule is a very precise three-dimensional shape containing an active site. The active site is the most important...

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