Enzymes are catalysts, what are catalysts you ask! They are protein molecules which speed up chemical reactions. Without them life would be impossible. Enzymes break down substances into a more simple substance that living things can use. A single enzyme can perform its function a million times a minute. The human body has over a thousand kinds of enzymes. We need enzymes in our digestive system to help our body  break down the complex food we eat into simpler substances then we need them to form complex substances to build up body tissue. Enzymes are made of protein, each enzyme type has a differently shaped molecule. The study of enzymes is interesting and makes a very good assignment if you would like to know more look up a book on biology at the library.











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