A-LevelBiologyGas exchange9700/12 · May/June 2018 · Q331 Mark

Which of these statements about the formation of haemoglobinic acid are correct? 1 It can only occur with the dissociation of oxygen from haemoglobin. 2 It removes excess hydrogen ions preventing blood becoming too acidic. 3 It is linked to the action of carbonic anhydrase.

A1, 2 and 3

B1 and 2 only

C1 only

D2 and 3 only

✓ Correct answer

A: 1, 2 and 3

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Topic: Gas exchange, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2018 Paper 1 Variant 2, question 33.

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