A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2025 · 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

C: every fourth amino acid is glycine: not correct, fibrous protein: correct

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Topic: Biological molecules, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2025 Paper 1 Variant 2, question 12.

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