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CAIE A-Level Biology 2.3.8 Collagen Molecules and Fibres

Practise linking three polypeptide chains, glycine at every third position, hydrogen bonds and cross-links to collagen triple helices, staggered fibrils and fibres.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • describe three helical polypeptide chains wound tightly into a collagen triple helix
  • explain how small glycine residues at every third position allow close packing
  • distinguish molecular triple helices from staggered fibrils and larger collagen fibres

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