A-LevelBiologyTransport in mammals9700/12 · Feb/Mar 2021 · Q331 Mark

Which substances can combine with adult haemoglobin and reduce the oxygen-carrying capacity of the blood? 1 carbon dioxide 2 carbon monoxide 3 hydrogencarbonate ions 4 hydrogen ions

A1, 2, 3 and 4

B1, 2 and 4 only

C1 and 3 only

D2 and 4 only

✓ Correct answer

B: 1, 2 and 4 only

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2021 Paper 1 Variant 2, question 33.

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