MCAT General Chemistry Question 220: Answer and Explanation
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Question: 220
5. Which of the following best describes the role of pepsin in the process of proteolysis?
- A. It stabilizes the structure of the amino acid end products.
- B. It lowers the energy requirement needed for the reaction to proceed.
- C. It increases the Keq of proteolysis.
- D. It lowers the free energy of the peptide reactant.
Correct Answer: B
Explanation:
B Pepsin is an enzyme, a biological catalyst. Catalysts lower the activation energy by providing the correct orientation of reactants for a reaction to proceed. Enzymes make a reaction go faster and affect the kinetics of the reaction, making choice B the best answer. Stability of the products, Keq, and free energy of the reactants are all thermodynamic properties, so choices A, C, and D are eliminated.