A-LevelBiologyGas exchangeOct/Nov 2018Paper 1 Q321 Mark

Haemoglobin can bind to carbon dioxide, carbon monoxide and oxygen. Which statement about the binding sites of haemoglobin is correct?

Q: What topic does this question test?

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

ACarbon dioxide and carbon monoxide bind to one site, oxygen binds to a different site.

BCarbon dioxide and oxygen bind to one site, carbon monoxide binds to a different site.

CCarbon monoxide and oxygen bind to one site, carbon dioxide binds to a different site.

DCarbon monoxide, oxygen and carbon dioxide all bind to different sites.

✓ Correct Answer

The correct answer is C: Carbon monoxide and oxygen bind to one site, carbon dioxide binds to a different site.

📋 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 2018 examination, Paper 1 Variant 2.

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