Transport of gases in the blood Quiz
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5 questions, one answer each
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1. What is the effect of a high partial pressure of CO₂ on haemoglobin?
- A. Increases its affinity for oxygen
- B. Decreases its affinity for oxygen
- C. Makes it lose its haem groups
- D. Has no effect on oxygen binding
2. Which describes myoglobin compared with adult haemoglobin?
- A. Four polypeptides and a lower affinity
- B. One polypeptide and a higher affinity
- C. One polypeptide and a lower affinity
- D. Four polypeptides and a higher affinity
3. What ion is found at the centre of a haem group?
- A. Magnesium
- B. Calcium
- C. Sodium
- D. Iron(II)
4. At the same partial pressure of oxygen, fetal haemoglobin is more saturated than adult haemoglobin. Which conclusion is correct?
- A. It has a lower affinity for oxygen
- B. Its curve is to the right of the adult curve
- C. It has a higher affinity for oxygen
- D. It cannot take oxygen from maternal blood
5. Why does the oxygen dissociation curve of haemoglobin steepen as the partial pressure rises?
- A. Oxygen binding makes it easier for further oxygen to bind
- B. The haem groups multiply
- C. Haemoglobin is destroyed
- D. Carbon dioxide is released