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What happens to enzymes after they speed up a biochemical reaction?

User Hixi
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enzymes make reactions go faster (catalyze reactions), but once the reaction is complete the enzyme is just like it was before the reaction.
User Spackmat
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Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Then enzymes speed up reactions by lowering activation energy. Many enzymes change shape when substrates bind.
User Dmitry Pavlenko
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