A-LevelBiologyGas exchangeOct/Nov 2021Paper 1 Q321 Mark
What explains how the maximum volume of oxygen is taken up as blood passes through the capillaries of the lungs?
AEach haemoglobin molecule can temporarily bind to four oxygen atoms.
BThe dissociation of carbon dioxide from carboxyhaemoglobin allows more haemoglobin to be available for binding oxygen.
CThe binding of the first oxygen molecule to haemoglobin decreases the affinity of haemoglobin for binding other oxygen molecules.
DOxyhaemoglobin formation increases the ability of red blood cells to transport oxygen.
✓ 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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