A-LevelBiologyGas exchange9700/12 · Feb/Mar 2017 · Q351 Mark
The graph shows the oxygen dissociation curves of haemoglobin from two species of mammal, S and T. Which statements could explain the difference in the oxygen dissociation curves of species S and species T? 1 Species T has a lower haemoglobin concentration in its red blood cells than species S. 2 The haemoglobin in species T has a lower affinity for oxygen than the haemoglobin in species S. 3 Species T lives at higher altitudes than species S.
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A1, 2 and 3
B1 and 2 only
C2 only
D3 only
✓ Correct answer
C: 2 only
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