Selected MCQ

Current Question
In oxidative phosphorylation, oxygen serves as the terminal:
  • A. Electron donor
  • B. ATP inhibitor
  • C. Electron acceptor
  • D. Proton source only
Correct Answer: C
Explanation:
(O_2) accepts electrons at the end of the mitochondrial electron transport chain.
Related Question 1
Which blood cells carry oxygen?
  • A. WBC
  • B. RBC
  • C. Platelets
  • D. Plasma
Correct Answer: B
Explanation:
Red blood cells transport oxygen.
Related Question 2
Which molecule carries oxygen in muscle?
  • A. Hemoglobin
  • B. Myoglobin
  • C. Collagen
  • D. Keratin
Correct Answer: B
Explanation:
Myoglobin stores oxygen in muscle.
Related Question 3
Which blood vessel carries oxygenated blood?
  • A. Vein
  • B. Artery
  • C. Capillary
  • D. Venule
Correct Answer: B
Explanation:
Arteries carry oxygen-rich blood (except pulmonary).
Related Question 4
Which plant process releases oxygen?
  • A. Respiration
  • B. Photosynthesis
  • C. Transpiration
  • D. Diffusion
Correct Answer: B
Explanation:
Oxygen released during light reactions.
Related Question 5
Which law conserves charge?
  • A. Newton’s law
  • B. Ohm’s law
  • C. Kirchhoff’s law
  • D. Boyle’s law
Correct Answer: C
Explanation:
Kirchhoff’s laws conserve current and charge.