Question

Which statement BEST describes how enzymes affect the speed of a metabolic reaction?

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Enzymes replace the reactants in a chemical reaction, which decreases the speed of the reaction.

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Enzymes prevent products from being converted back into reactants, which decreases the speed of the reaction.

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Enzymes decrease the energy needed to start a reaction, which increases the speed of the reaction.

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Enzymes increase the concentration of reactants, which increases the speed of the reaction.

Answer 1

Enzymes decrease the energy needed to start a reaction, which increases the speed of the reaction.

Explanation: Enzymes lower the activation energy required for a reaction, allowing more reactant molecules to convert to product per unit time.