Haemoglobin and oxygen transport Quiz
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5 questions, one answer each
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1. Which statement about human haemoglobin is correct?
- A. It has one polypeptide chain and one haem group
- B. It has four polypeptide chains, each with a haem group
- C. It has two chains and carries two oxygen molecules
- D. It is found in the plasma, not in red blood cells
2. Why does the oxyhaemoglobin dissociation curve rise steeply in its middle section?
- A. Cooperative binding makes it easier for further oxygen to bind after the first
- B. Oxygen is more soluble at higher partial pressures
- C. All binding sites are occupied at low partial pressure
- D. Haemoglobin is denatured at low partial pressures
3. In which way does an increase in carbon dioxide concentration affect haemoglobin?
- A. It increases affinity for oxygen and shifts the curve left
- B. It has no effect on affinity
- C. It reduces affinity for oxygen and shifts the curve right
- D. It increases the number of oxygen binding sites
4. Haemoglobin from an animal living at high altitude is 50% saturated at a lower pO₂ than human haemoglobin. What does this show?
- A. It has a lower affinity for oxygen
- B. It cannot unload oxygen
- C. It has no haem groups
- D. It has a higher affinity for oxygen
5. A small mammal has a very high metabolic rate. Which haemoglobin is most suitable?
- A. One with a very high affinity, so it holds on to oxygen
- B. One with a lower affinity, so it unloads oxygen readily at the tissues
- C. One with no cooperative binding
- D. One that binds carbon dioxide only