A-LevelBiologyTransport in mammalsMay/June 2016Paper 1 Q291 Mark

The graph shows changes in percentage saturation of haemoglobin with oxygen in the blood of a human and of another animal. The partial pressure of carbon dioxide remains constant at 1.0kPa and the temperature is constant at 25°C. [Figure 29.1] Which conclusion is supported by the graph?

Q: What topic does this question test?

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

AAt 25 °C the affinity of haemoglobin for oxygen increases more in humans than in the animal.

BHaemoglobin in the animal carries less oxygen than haemoglobin in the human.

COxygen is more easily released from haemoglobin in animal muscle than in human muscle.

DThe Bohr effect in the haemoglobin of the animal is greater than in human haemoglobin.

✓ Correct Answer

The correct answer is C: Oxygen is more easily released from haemoglobin in animal muscle than in human muscle.

📋 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 Transport in mammals in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2016 examination, Paper 1 Variant 2.

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