A-LevelBiologyGas exchangeFeb/Mar 2019Paper 1 Q301 Mark
Which statements about the formation of haemoglobinic acid are correct? 1 It is linked to the action of carbonic anhydrase. 2 It prevents blood from becoming too acidic by removing excess hydrogen ions. 3 It can only occur when oxygen associates with haemoglobin.
A1, 2 and 3
B1 and 2 only
C1 only
D2 and 3 only
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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