A-LevelBiologyTransport in mammalsFeb/Mar 2021Paper 1 Q311 Mark
The table shows the results used to draw an oxygen dissociation curve for adult haemoglobin. partial pressure of oxygen /kPa: 1, 2, 3, 4, 5, 6, 7 volume of oxygen per gram of haemoglobin/cm³g⁻¹: 0.11, 0.32, 0.58, 0.77, 0.96, 1.07, 1.15 What is the percentage increase in the volume of oxygen per gram of haemoglobin when the partial pressure of oxygen increases from 3 kPa to 5 kPa?
A32.8%
B39.6%
C60.4%
D65.5%
✓ Correct Answer
The correct answer is D: 65.5%
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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