A-LevelBiologyCell structureMay/June 2020Paper 2 Q410 Marks
Collagen is a major component of the cartilage found in some of the structures of the human gas exchange system. Cells that synthesise and secrete the components of cartilage are known as chondrocytes. Fig. 4.1 is a transmission electron micrograph of a chondrocyte. Fig. 4.2 shows part of the primary structure of a collagen polypeptide. Fig. 4.3 shows the molecular structure of the amino acid glycine (gly).
📋 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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