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Original practice questions by QuizGen. These are not official AAMC questions. Try each question before opening its answer.
An enzyme speeds up a reaction. Which quantity does the enzyme reduce?
Answer: A. An enzyme lowers the activation barrier. It does not change the reaction’s Gibbs free-energy difference.
Researchers measure initial reaction rates with equal enzyme concentrations. At low substrate concentration, the rate is 12 units without inhibitor and 6 with inhibitor. At high substrate concentration, both rates approach 30 units. Which explanation best fits these results?
Answer: B. The same maximum rate can be reached when more substrate is present. This pattern supports competitive inhibition; the measurements alone do not prove a binding location.
Answer concepts: OpenStax Biology 2e, section 6.5 explains enzyme catalysis and competitive inhibition. The questions and experimental numbers above were written for this page.
Enzymes are part of AAMC content category 1A. These two examples cover one topic; use the AAMC section overview to plan broader biology and biochemistry practice. Sources checked October 26, 2026.
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These are original QuizGen practice questions. Use the AAMC content outline to check which topics you need to study.
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