Enzymes increase the rate of a reaction by
Correct answer: B. lowering the activation energy of the reaction
- A. raising the temperature of the reaction mixture
- B. lowering the activation energy of the reaction
- C. changing the equilibrium position in favour of the products
- D. supplying the energy the reaction needs
Explanation
An enzyme provides an alternative route with a lower activation energy, so a much larger fraction of molecules has enough energy to react at body temperature. It does not change the free energy difference between reactants and products, which means the equilibrium position stays exactly where it was and only the time taken to reach it falls. Enzymes supply no energy of their own.
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About Mode of Enzyme Action
Enzyme action depends on the active site forming a temporary enzyme substrate complex, then converting substrate into products with lower activation energy. The lock and key and induced fit models explain specificity and binding, while cofactors and changes in enzyme shape can affect catalysis.
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