Multiple Choice
What effect does an enzyme have on a chemical reaction?
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6. Enzymes and Enzyme Kinetics
Enzymes
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What effect does an enzyme have on a chemical reaction?
A
It increases the overall free energy change (\( \Delta G \)) of the reaction.
B
It lowers the activation energy required for the reaction.
C
It changes the equilibrium position of the reaction.
D
It is consumed during the reaction.
Verified step by step guidance1
Understand the role of enzymes in chemical reactions: Enzymes are biological catalysts that speed up reactions without being consumed in the process. They achieve this by lowering the activation energy required for the reaction to proceed.
Clarify the concept of activation energy: Activation energy is the minimum energy required for reactants to transform into products. Enzymes provide an alternative reaction pathway with a lower activation energy, making the reaction faster.
Examine the effect on equilibrium: 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 the misconception about enzyme consumption: Enzymes are not consumed during the reaction. They remain unchanged and can be reused for multiple reaction cycles.
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