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?

Q: What topic does this question test?

This question tests Gas exchange in A-Level Biology (syllabus code 9700). It is worth 1 mark.

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: carbonic anhydrase: no change, hydrogencarbonate ions: increase, hydrogen ions: increase

📋 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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About This A-Level Biology Question

Topic

This multiple-choice question tests Gas exchange in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2011 examination, Paper 1 Variant 2.

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