Selected MCQ

Current Question
Hemoglobin’s oxygen affinity is decreased by lower pH due to the:
  • A. Pasteur effect
  • B. Bohr effect
  • C. Warburg effect
  • D. Haldane law of diffusion
Correct Answer: B
Explanation:
Protonation stabilizes deoxyhemoglobin, promoting oxygen release in acidic tissues.
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 structure carries oxygen in blood?
  • A. Plasma
  • B. Hemoglobin
  • C. Platelets
  • D. Antibodies
Correct Answer: B
Explanation:
Hemoglobin binds oxygen.