A-LevelBiologyGas exchange9700/12 · Oct/Nov 2020 · Q301 Mark

The diagram is a summary of the role of haemoglobin in the transport of carbon dioxide. [Figure 30.1] Which set of labels is correct?

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A1 = facilitated diffusion, 4 = carbonic acid, 7 = hydrogencarbonate ions

B2 = water, 8 = dissociation, 10 = carbaminohaemoglobin

C3 = carbonic anhydrase, 9 = oxyhaemoglobin, 11 = carbaminohaemoglobin

D5 = carbonic anhydrase, 6 = hydrogen ions, 12 = red blood cell

✓ Correct answer

C: 3 = carbonic anhydrase, 9 = oxyhaemoglobin, 11 = carbaminohaemoglobin

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2020 Paper 1 Variant 2, question 30.

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