ACT Science Practice Question #1501 (Hard (33)) | Test Citadel
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ACT Science Difficulty: Hard (33)

Digital ACT Science Practice Question #1501

Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.

An enzyme was tested with a constant substrate concentration in the presence of an inhibitor: - No inhibitor: Vmax = 100 umol/min, Km = 2.0 mM - Inhibitor X: Vmax = 100 umol/min, Km = 6.5 mM - Inhibitor Y: Vmax = 55 umol/min, Km = 2.0 mM Inhibitor X is characterized as a competitive inhibitor because:
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Competitive inhibition: Vmax stays same (100), Km increases (2.0 to 6.5).

Masterclass Solution & Distractor Trap Analysis

Competitive inhibitors compete for the active site, increasing Km while Vmax can still be reached at high substrate levels....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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