A-LevelBiologyGas exchangeMay/June 2015Paper 1 Q301 Mark

What does not help to maximise uptake of oxygen as blood flows through capillaries in the lungs?

Q: What topic does this question test?

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

ADissociation of carbon dioxide from carboxyhaemoglobin allows more haemoglobin to be available for oxygen binding.

BEach haemoglobin molecule can temporarily bind to eight oxygen atoms.

COxyhaemoglobin formation increases the capacity of red blood cells to transport oxygen.

DThe binding of the first oxygen molecule to haemoglobin increases the molecule's affinity for binding other oxygen molecules.

✓ Correct Answer

The correct answer is A: Dissociation of carbon dioxide from carboxyhaemoglobin allows more haemoglobin to be available for oxygen binding.

📋 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 2015 examination, Paper 1 Variant 2.

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