Multiple Choice
Which of the following statements about enzymes is correct?
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6. Enzymes and Enzyme Kinetics
Enzymes
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Which of the following correctly describes how organic catalysts (enzymes) operate in biological reactions?
A
They lower the activation energy required for a reaction to proceed.
B
They change the equilibrium position of the reaction.
C
They increase the overall free energy change (\( \Delta G \)) of the reaction.
D
They are consumed during the reaction and cannot be reused.
Verified step by step guidance1
Understand the role of enzymes in biological reactions: Enzymes are organic catalysts that speed up reactions by lowering the activation energy, which is the energy barrier that must be overcome for a reaction to proceed.
Clarify the concept of activation energy: Activation energy is the minimum energy required for reactants to transform into products. Enzymes achieve this by stabilizing the transition state, making it easier for the reaction to occur.
Examine the equilibrium position: Enzymes do not change the equilibrium position of a reaction. They only affect the rate at which equilibrium is reached, not the final concentrations of reactants and products.
Discuss the free energy change (
): Enzymes do not alter the overall free energy change of a reaction. The value of
remains the same whether an enzyme is present or not.
Address enzyme reuse: Enzymes are not consumed during the reaction. They remain unchanged after facilitating the reaction and can be reused multiple times for the same type of reaction.
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