A-LevelBiologyGas exchange9700/12 · May/June 2017 · Q321 Mark

An athlete who smokes just before a race may not be able to run at their maximum speed because less oxygen is carried by the blood. Which explanation is correct?

ACarbon dioxide binds to haemoglobin forming carbaminohaemoglobin.

BCarbon dioxide binds to haemoglobin forming carboxyhaemoglobin.

CCarbon monoxide binds to haemoglobin forming carbaminohaemoglobin.

DCarbon monoxide binds to haemoglobin forming carboxyhaemoglobin.

✓ Correct answer

D: Carbon monoxide binds to haemoglobin forming carboxyhaemoglobin.

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2017 Paper 1 Variant 2, question 32.

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