A-LevelBiologyTransport in mammalsMay/June 2016Paper 1 Q301 Mark
Which statements about the formation of haemoglobinic acid are correct? 1 It can only occur with the dissociation of oxygen from haemoglobin. 2 It acts to prevent excess hydrogen ions causing acidity in blood. 3 It depends on the release of hydrogen ions by the action of carbonic anhydrase.
A1, 2 and 3
B1 and 2 only
C2 and 3 only
D1 only
✓ Correct Answer
The correct answer is A: 1, 2 and 3
📋 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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