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.

Q: What is the correct answer to this A-Level Biology question?

The correct answer is B: 1 only.

Q: What topic does this question test?

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

A1 and 2

B1 only

C2 and 3

D3 and 4

✓ Correct Answer

The correct answer is B: 1 only

📋 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 Feb/Mar 2017 examination, Paper 1 Variant 2.

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