A-LevelBiologyGas exchangeOct/Nov 2019Paper 1 Q301 Mark
When active tissues have high carbon dioxide concentrations, oxyhaemoglobin releases oxygen to these tissues. What encourages this release in the presence of high concentrations of carbon dioxide? 1 carboxyhaemoglobin forms more readily 2 oxyhaemoglobin dissociates more readily 3 haemoglobin needs higher concentrations of oxygen to become saturated
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 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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