A-LevelBiologyGas exchangeFeb/Mar 2025Paper 1 Q301 Mark
Which statements about the transport of carbon dioxide in the blood are correct? 1 Carbonic anhydrase catalyses the reaction of carbon dioxide and water to form carbonic acid. 2 Carbonic acid dissociates into hydrogen ions and hydrogencarbonate ions. 3 Some carbon dioxide combines with haemoglobin to form carbaminohaemoglobin. 4 Haemoglobin readily combines with hydrogencarbonate ions to form haemoglobinic acid.
A1, 2 and 3
B1, 2 and 4
C1, 3 and 4
D2, 3 and 4
✓ Correct Answer
The correct answer is A. 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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