A-LevelBiologyGas exchangeFeb/Mar 2016Paper 1 Q291 Mark
Which reactions take place at a higher rate in a capillary in an alveolus than in a capillary in active muscle? 1 carbon dioxide + water → carbonic acid 2 carbon dioxide + haemoglobin → carboxyhaemoglobin 3 haemoglobin + hydrogen ions → haemoglobinic acid 4 hydrogencarbonate ions + hydrogen ions → carbon dioxide + water
A1 and 2
B3 and 4
C1 only
D4 only
✓ Correct Answer
The correct answer is D. 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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