A-LevelBiologyBiological moleculesOct/Nov 2025Paper 1 Q121 Mark
Collagen is a protein that helps to strengthen and increase the elasticity and hydration of the skin. Aging can lead to dry skin and the formation of wrinkles, due to the body producing less collagen. Which row is correct for the structure of collagen in the skin?
Aevery fourth amino acid is glycine: not correct, fibrous protein: not correct
Bevery fourth amino acid is glycine: correct, fibrous protein: correct
Cevery fourth amino acid is glycine: not correct, fibrous protein: correct
Devery fourth amino acid is glycine: correct, fibrous protein: not correct
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of biological molecules 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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