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BIO NMDCAT Inhibitors
nmdcat.online July 13, 2026

During an experiment, two test tubes contain identical amounts of enzyme and substrate. One tube also contains a competitive inhibitor. The reaction rate becomes nearly equal in both tubes after adding excess substrate because

A. The substrate outcompetes the inhibitor for the active site
✓
B. The inhibitor is converted into substrate
C. The enzyme synthesizes additional active sites
D. The inhibitor changes into a cofactor

📝 Explanation

Increasing substrate concentration increases the likelihood of substrate binding instead of inhibitor binding, restoring enzyme activity. The remaining options are biologically incorrect. Concept tested: Reversibility of competitive inhibition.

📖 Additional Information

  • The substrate outcompetes the inhibitor for the active site
  • The inhibitor is converted into substrate
  • The enzyme synthesizes additional active sites
  • The inhibitor changes into a cofactor

Increasing substrate concentration increases the likelihood of substrate binding instead of inhibitor binding, restoring enzyme activity. The remaining options are biologically incorrect. Concept tested: Reversibility of competitive inhibition.

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