A-LevelBiologyTransport in mammalsMay/June 2025Paper 2 Q612 Marks
Fig. 6.1 is a ribbon model of a molecule of haemoglobin. The effect of the partial pressure of oxygen (pO2) and the effect of the partial pressure of carbon dioxide (pCO2) on the percentage saturation of haemoglobin was investigated. A sample of mammalian blood was exposed to a gas mixture that contained increasing pO2. In the experiment, the pCO2 was maintained at 2.7kPa. The percentage saturation of haemoglobin in the blood sample was determined as the pO2 increased. The experiment was repeated with further samples of blood with a pCO2 maintained at 5.3 kPa and at 10.7 kPa. The results are shown in Fig. 6.2. [Figure 6.1] [Figure 6.2]
✓ Correct Answer
The correct answer is —. This question tests the candidate's understanding of transport in mammals 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep