A-LevelBiologyGas exchange9700/12 · Feb/Mar 2019 · Q311 Mark
The graph shows the oxygen dissociation curves of haemoglobin for eight species of mammal. [Figure shows oxygen dissociation curves for 8 mammals, with a key relating numbers 1-8 to decreasing order of size] Which conclusion is consistent with the data shown in the graph?
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AThe haemoglobin of larger mammals will combine with oxygen at a lower partial pressure of oxygen than that of smaller mammals.
BThe haemoglobin of larger mammals will release oxygen at a higher partial pressure of oxygen than that of smaller mammals.
CThe metabolic activity of the mammal is directly proportional to the ability of its haemoglobin to release oxygen.
DThe size of the mammal is directly proportional to the ability of its haemoglobin to release oxygen.
✓ Correct answer
A: The haemoglobin of larger mammals will combine with oxygen at a lower partial pressure of oxygen than that of smaller mammals.
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