A-LevelBiologyGas exchangeMay/June 2021Paper 1 Q301 Mark
What is the main reaction occurring in blood capillaries at the gas exchange surface in a human lung?
ACarbonic acid dissociates into carbon dioxide and hydrogen ions.
BCarbonic anhydrase converts carbon dioxide into hydrogencarbonate ions.
CCarbon dioxide combines with haemoglobin to form carbaminohaemoglobin.
DCarbon dioxide is produced from hydrogencarbonate ions by carbonic anhydrase.
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The correct answer is D. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
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