A-LevelBiologyGas exchangeFeb/Mar 2016Paper 1 Q301 Mark
The diagram shows the effect of three different concentrations of carbon dioxide on the oxygen dissociation curve for human haemoglobin. What effect does increasing carbon dioxide concentration have on haemoglobin? [Figure 30.1]
AIt makes it less efficient at taking up oxygen and less efficient at releasing it.
BIt makes it less efficient at taking up oxygen and more efficient at releasing it.
CIt makes it more efficient at taking up oxygen and less efficient at releasing it.
DIt makes it more efficient at taking up oxygen and more efficient at releasing it.
✓ 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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