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Shortcut used: Identify the tested biochemical principle, track charge/carbon/electrons or pathway direction, use the passage data, and reject choices that contradict cellular location or chemical behavior.
Solve in 3 steps:
- Mark the given values and the exact target.
- Apply the relevant formula, rule, or concept.
- Check the final value against the options.
Common mistake: Do not choose an option before confirming the exact demand of the question.
Question 1
Multiple Choice Question
Question
PASSAGE 1 — ENZYME KINETICS
Researchers study an enzyme that converts substrate S to product P. Without inhibitor, the enzyme has Vmax = 100 micromoles per minute and Km = 2 mM. In the presence of compound X, Vmax remains 100 micromoles per minute, but the apparent Km rises to 6 mM. No irreversible loss of enzyme activity is detected after X is removed.
QUESTION 1: Which mechanism best explains the effect of compound X?
Explanation
Correct Answer: A
ANSWER
Correct Answer: A
Method / Topic: Biochemistry
The correct answer is A: Reversible competitive inhibition. A competitive inhibitor raises the apparent Km because more substrate is needed to reach half of Vmax, while sufficiently high substrate concentration can still produce the original Vmax. The reversibility after X removal also argues against irreversible inhibition.
Why this answer is correct
The correct option matches the required rule and the given information.
Short Explanation
The correct answer is A: Reversible competitive inhibition. A competitive inhibitor raises the apparent Km because more substrate is needed to reach half of Vmax, while sufficiently high substrate concentration can still produce the original Vmax. The reversibility after X removal also argues against irreversible inhibition.
Detailed Explanation
Question
PASSAGE 1 — ENZYME KINETICS
Researchers study an enzyme that converts substrate S to product P. Without inhibitor, the enzyme has Vmax = 100 micromoles per minute and Km = 2 mM. In the presence of compound X, Vmax remains 100 micromoles per minute, but the apparent Km rises to 6 mM. No irreversible loss of enzyme activity is detected after X is removed.
QUESTION 1: Which mechanism best explains the effect of compound X?
ANSWER
Correct Answer: A
Method / Topic: Biochemistry
A competitive inhibitor raises the apparent Km because more substrate is needed to reach half of Vmax, while sufficiently high substrate concentration can still produce the original Vmax. The reversibility after X removal also argues against irreversible inhibition. To solve this kind of MCAT biochemistry
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Question 1
Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Learn + solve
Shortcut used, common trap, and the fastest solving route
Shortcut used: Identify the tested biochemical principle, track charge/carbon/electrons or pathway direction, use the passage data, and reject choices that contradict cellular location or chemical behavior.
Solve in 3 steps:
- Mark the given values and the exact target.
- Apply the relevant formula, rule, or concept.
- Check the final value against the options.
Common mistake: Do not choose an option before confirming the exact demand of the question.
Question
PASSAGE 1 — ENZYME KINETICS Researchers study an enzyme that converts substrate S to product P. Without inhibitor, the enzyme has Vmax = 100 micromoles per minute and Km = 2 mM. In the presence of compound X, Vmax remains 100 micromoles per minute, but the apparent Km rises to 6 mM. No irreversible loss of enzyme activity is detected after X is removed. QUESTION 1: Which mechanism best explains the effect of compound X?
Explanation
Correct Answer: A
ANSWER
Correct Answer: A
Method / Topic: Biochemistry
The correct answer is A: Reversible competitive inhibition. A competitive inhibitor raises the apparent Km because more substrate is needed to reach half of Vmax, while sufficiently high substrate concentration can still produce the original Vmax. The reversibility after X removal also argues against irreversible inhibition.
Why this answer is correct
The correct option matches the required rule and the given information.
Short Explanation
The correct answer is A: Reversible competitive inhibition. A competitive inhibitor raises the apparent Km because more substrate is needed to reach half of Vmax, while sufficiently high substrate concentration can still produce the original Vmax. The reversibility after X removal also argues against irreversible inhibition.
Detailed Explanation
Question
PASSAGE 1 — ENZYME KINETICS
Researchers study an enzyme that converts substrate S to product P. Without inhibitor, the enzyme has Vmax = 100 micromoles per minute and Km = 2 mM. In the presence of compound X, Vmax remains 100 micromoles per minute, but the apparent Km rises to 6 mM. No irreversible loss of enzyme activity is detected after X is removed.
QUESTION 1: Which mechanism best explains the effect of compound X?
ANSWER
Correct Answer: A
Method / Topic: Biochemistry
A competitive inhibitor raises the apparent Km because more substrate is needed to reach half of Vmax, while sufficiently high substrate concentration can still produce the original Vmax. The reversibility after X removal also argues against irreversible inhibition. To solve this kind of MCAT biochemistry
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