Which row correctly describes haemoglobin? [Table with four columns describing aspects of haemoglobin]
✓ Correct Answer
The correct answer is A: four polypeptide chains, each containing a haem group iron ions can associate with oxygen, forming oxyhaemoglobin in each chain, hydrophobic R-groups of amino acids point towards the centre of the molecule at 50% saturation, two oxygen molecules are transported by the molecule
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep