Haemoglobin and oxygen transport Quiz
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5 questions, one answer each
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1. Which ion in the haem group binds oxygen?
- A. Fe³⁺
- B. Fe²⁺
- C. Mg²⁺
- D. Ca²⁺
2. Which enzyme catalyses the reaction of carbon dioxide with water in red blood cells?
- A. Carboxypeptidase
- B. Catalase
- C. Amylase
- D. Carbonic anhydrase
3. A dissociation curve shifted to the left shows that haemoglobin has…
- A. a higher affinity for oxygen
- B. a lower affinity for oxygen
- C. no affinity for oxygen
- D. a higher affinity for carbon dioxide
4. What is the purpose of the chloride shift?
- A. To release oxygen from haemoglobin
- B. To lower the pH of the plasma
- C. To maintain electrical balance as hydrogencarbonate ions leave red blood cells
- D. To carry carbon dioxide to the lungs as carbaminohaemoglobin
5. A muscle is respiring rapidly and its blood pH falls. What is the effect on the oxygen dissociation curve of haemoglobin in that blood?
- A. It shifts left, so more oxygen is released
- B. It shifts right, so more oxygen is released at a given partial pressure
- C. It shifts left, so less oxygen is loaded
- D. It does not change