Which description is accurate?
- AA collagen molecule has a high proportion of the amino acid glycine, which has a very small side chain.
- BA group of three collagen fibres forms a strong, insoluble coiled structure termed a triple helix.
- CEach of the collagen polypeptides in a collagen molecule has a regular spiral arrangement of many alpha helices.
- DPeptide bonds are present between amino acids of the same polypeptide and between the different polypeptides forming the collagen molecule.