Multiple Choice
Which of the following macromolecules can commonly act as a catalyst in biological systems?
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6. Enzymes and Enzyme Kinetics
Enzymes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following best describes the effect of enzymes on chemical reactions?
A
They increase the overall free energy change ($\Delta G$) of the reaction.
B
They lower the activation energy required for the reaction to proceed.
C
They change the equilibrium position 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 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 lower this energy barrier, making it easier for the reaction to occur.
Examine the effect of enzymes on the overall free energy change ($\Delta G$): Enzymes do not alter the overall free energy change of a reaction. The value of $\Delta G$ is determined by the difference in energy between reactants and products, which remains constant regardless of enzyme presence.
Discuss the equilibrium position of the reaction: Enzymes do not change the equilibrium position of a reaction. They only speed up the rate at which equilibrium is reached, but the ratio of reactants to products at equilibrium remains unchanged.
Address the misconception about enzyme consumption: Enzymes are not consumed during the reaction. They remain unchanged and can be reused for multiple reaction cycles, making them highly efficient catalysts.
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