Enzymes are ____ that ____ chemical reactions by lowering the ____ . Enzymes are ____ because they speed up chemical reactions. Enzymes either put two molecules together into one larger molecule, or take one large molecule apart. The molecule(s) that the enzyme works on are called ____ Each enzyme works on ____ substrate, and it can ____ that reaction ____. Enzymes have ____ ranges for ____ and ____ . Outside of these ranges they ____ . If an enzyme gets ____, or if ____ is too extreme, it will ____. Once this has happened, the enzyme ____ and ____.

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