A-LevelBiologyGas exchangeOct/Nov 2011Paper 1 Q251 Mark
Which row shows the changes in concentration in the red blood cells when carbon dioxide diffuses from respiring cells?
Acarbonic anhydrase: decreases, hydrogencarbonate ions: no change, hydrogen ions: no change
Bcarbonic anhydrase: increases, hydrogencarbonate ions: increases, hydrogen ions: increases
Ccarbonic anhydrase: no change, hydrogencarbonate ions: decrease, hydrogen ions: increase
Dcarbonic anhydrase: no change, hydrogencarbonate ions: increase, hydrogen ions: increase
✓ 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...
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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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