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Biology Coursework Factors effecting enzyme activity Aim: To investigate the effect of temperature on the rate of catalase activity. Enzymes are proteins that act as catalysts, which are made in the cells. A catalyst is a chemical substance that speeds up a reaction but does not get used up in the process. Enzymes can be used over and over. There are two types of enzyme reactivity, these are called anabolic and catabolic reactions. An anabolic reaction is where large molecules are built up from smaller molecule. A catabolic reaction is where reactions split large molecules into smaller ones. Enzymes work by a method called the lock and key method: Basically it works by the enzyme meeting the substrate and they both fit together well to make an enzyme-substrate complex. This works well because enzymes have a definite three dimensional shapes which is complementary to the shape of the substrate. In the...

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