A-LevelBiologyGas exchangeMay/June 2017Paper 1 Q321 Mark
An athlete who smokes just before a race may not be able to run at their maximum speed because less oxygen is carried by the blood. Which explanation is correct?
ACarbon dioxide binds to haemoglobin forming carbaminohaemoglobin.
BCarbon dioxide binds to haemoglobin forming carboxyhaemoglobin.
CCarbon monoxide binds to haemoglobin forming carbaminohaemoglobin.
DCarbon monoxide binds to haemoglobin forming carboxyhaemoglobin.
✓ 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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