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Biology AT 1 - Experiment to investigate the effect of surface area on the rate of reaction. Introduction. Enzymes are proteins that behave like as biological catalysts. They are produced inside the cells of the body. It can never be exhausted and is usually used many times. There are two types of reaction that can occur, anabolic and catabolic. Anabolic involves the creation of a complex molecule from simpler molecules (e.g. glucose, for storage, is turned into starch for later use, in plants): However, catabolic is the directly opposite reaction, breaking complex molecules into simpler ones (e.g. protease enzymes turn proteins into amino acids): This theory is called the "lock and key" because it shows how the enzymes are specific to what they can/cannot break down or make molecules. Therefore only one enzyme is able to break/make a molecule due to its structure. Equally, this occurs with the substrate, Catalase. The gap is known...

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