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Enzymes enhance the rate of reaction by

1. forming a reactant-product complex
2. changing the equilibrium point of the reaction
3. combining with the product as soon as it is formed
4. lowering the activation energy of the reaction

Correct answer: lowering the activation energy of the reaction

Solution

Enzymes act as catalysts, so they increase reaction rate by providing an alternative pathway with a lower activation energy. They do not change the equilibrium position; they only help the system reach equilibrium faster.

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