A-LevelBiologyGas exchangeMay/June 2013Paper 1 Q311 Mark
Which statement is true for the Bohr effect?
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. 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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