A-LevelBiologyGas exchangeMay/June 2014Paper 1 Q281 Mark
The graph shows the percentage saturation of haemoglobin with oxygen at different partial pressures of oxygen and two different concentrations of carbon dioxide. [Figure 28.1] What is the effect of increasing the concentration of carbon dioxide?
AIt increases the affinity of haemoglobin for oxygen at respiring tissues.
BIt increases the dissociation of haemoglobinic acid inside red blood cells.
CIt increases the dissociation of oxygen from haemoglobin at respiring tissues.
DIt increases the inhibition of carbonic anhydrase enzyme in red blood cells.
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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