Enzymes are a type of ____. They are known as biological ____ because they ____ reactions without being used up. They consist of a region known as an ____. This is where the ____ enters and is broken down. ____ are then released and the enzyme can then be reused. The ____ of the active site is ____ to the shape of the substrate and so each enzyme is ____ to a substrate. For example, ____ is specific for breaking down ____.

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