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Enzyme - different chemical reactions The substance changed...

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Enzymes The chemical reactions in all cells of living things operate in the  presence of biological catalysts called  enzymes.   Because a particular enzyme catalyzes only one reaction, there are  thousands of different enzymes in a cell catalyzing thousands of 
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Unformatted text preview: different chemical reactions. The substance changed or acted on by an enzyme is its substrate. The products of a chemical reaction catalyzed by an enzyme are end products....
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