A-LevelBiologyGas exchangeMay/June 2019Paper 1 Q291 Mark
The diagram shows the pathway for the transport of carbon dioxide that occurs in red blood cells. [Figure: Diagram of CO2 transport pathway] Which row is correct?
A1: carbaminohaemoglobin, 2: haemoglobinic acid, 3: hydrogen ions, 4: hydrogencarbonate ions
B1: carbonic anhydrase, 2: carbonic acid, 3: hydrogen ions, 4: hydrogencarbonate ions
C1: carboxyhaemoglobin, 2: carbonic anhydrase, 3: carbonic acid, 4: carbon dioxide
D1: haemoglobinic acid, 2: carbonic acid, 3: hydrogencarbonate ions, 4: hydrogen ions
✓ Correct Answer
The correct answer is B. 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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