A-LevelBiologyGas exchange9700/12 · Oct/Nov 2018 · Q321 Mark

Haemoglobin can bind to carbon dioxide, carbon monoxide and oxygen. Which statement about the binding sites of haemoglobin is correct?

ACarbon dioxide and carbon monoxide bind to one site, oxygen binds to a different site.

BCarbon dioxide and oxygen bind to one site, carbon monoxide binds to a different site.

CCarbon monoxide and oxygen bind to one site, carbon dioxide binds to a different site.

DCarbon monoxide, oxygen and carbon dioxide all bind to different sites.

✓ Correct answer

C: Carbon monoxide and oxygen bind to one site, carbon dioxide binds to a different site.

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2018 Paper 1 Variant 2, question 32.

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