Which row is correct about the structure of proteins? [Table describing primary, secondary, tertiary, and quaternary protein structures]
✓ Correct Answer
The correct answer is A: primary: determined by the sequence of DNA nucleotides; secondary: occurs by hydrogen bonding between NH and C=O groups of amino acids; tertiary: disulfide, ionic, hydrogen bonds and hydrophobic interactions are all involved; quaternary: always formed by association of two or more polypeptides
📋 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.
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