A-LevelBiologyGas exchangeMay/June 2013Paper 1 Q311 Mark

Which statement is true for the Bohr effect?

Q: What topic does this question test?

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

AAs the partial pressure of carbon dioxide increases the dissociation curve becomes S- shaped (sigmoid).

BAt higher partial pressures of carbon dioxide and equal partial pressures of oxygen, the percentage saturation of haemoglobin with oxygen will be higher.

CThe carbon dioxide in the air prevents haemoglobin becoming fully saturated with oxygen during gas exchange in the lungs.

DThe release of oxygen from haemoglobin is more likely at higher partial pressures of carbon dioxide.

✓ Correct Answer

The correct answer is D: The release of oxygen from haemoglobin is more likely at higher partial pressures of carbon dioxide.

📋 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 May/June 2013 examination, Paper 1 Variant 2.

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