A-LevelBiologyGas exchangeFeb/Mar 2017Paper 1 Q371 Mark
Which of these statements could describe the effect of carbon monoxide in cigarette smoke? 1 It binds irreversibly to haemoglobin. 2 It causes mucus to accumulate in the bronchioles. 3 It results in more carbon dioxide being transported in the blood. 4 It temporarily increases the heart rate.
A1 and 2
B1 only
C2 and 3
D3 and 4
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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