... the enzyme it is specified to. This can be explained as a lock and key hypothesis, where the lock and key are specific to each other, only, that there are many of the same kinds of lock and key when it come to the enzymes. Just as lock and keys have three-dimensional shapes, proteins are also three-dimensional. Usually, there is only one active site on an enzyme; however there can be more. Some energy releasing reactions in cells produce hydrogen peroxide. This is acidic, and can thus, kill cells (denaturation). Catalase is found in all living cells. It is used to remove hydrogen peroxide, which is produced during metabolism and is toxic if allowed to build up within cells. Celery cells contain the enzyme catalase which will be used as the enzyme in the experiment I carry out. Normally, hydrogen peroxide decomposes to form hydrogen (H2O) and oxygen: 2H2O2 2H2O ...

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