Selected MCQ

Current Question
Competitive inhibition usually increases the apparent:
  • A. (V_{max}) only
  • B. (K_m) without changing (V_{max})
  • C. (V_{max}) and decreases (K_m)
  • D. Catalytic constant irreversibly
Correct Answer: B
Explanation:
A competitive inhibitor reduces apparent substrate affinity but can be overcome at high substrate concentration.
Related Question 1
Which factor increases acidity of organic compounds?
  • A. Electron donating groups
  • B. Electron withdrawing groups
  • C. Alkyl substitution
  • D. Decreasing electronegativity
Correct Answer: B
Explanation:
Electron-withdrawing stabilizes conjugate base.
Related Question 2
Which process increases entropy most?
  • A. Freezing water
  • B. Mixing gases
  • C. Crystallization
  • D. Condensation
Correct Answer: B
Explanation:
Mixing increases randomness.
Related Question 3
The Fermi energy increases with:
  • A. Temperature
  • B. Particle density
  • C. Pressure only
  • D. Volume only
Correct Answer: B
Explanation:
Higher density raises highest occupied energy level.
Related Question 4
Which hormone increases heart rate?
  • A. Insulin
  • B. Adrenaline
  • C. Thyroxine
  • D. Estrogen
Correct Answer: B
Explanation:
Adrenaline stimulates cardiac activity.
Related Question 5
Which process increases entropy?
  • A. Freezing
  • B. Condensation
  • C. Mixing gases
  • D. Crystallization
Correct Answer: C
Explanation:
Mixing increases disorder.