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A-LevelBiologyGas exchange9700/12 · May/June 2021 · Q341 Mark

How many times must a molecule of carbon dioxide pass through a cell surface membrane as it diffuses from the plasma, through a cell in the capillary wall, into an alveolus?

A1
B2
C3
D4

✓ Correct answer

D: 4

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About this question

Topic
Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source
A-Level Biology, May/June 2021 Paper 1 Variant 2, question 34.

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