Which description is correct?
A collagen molecule has a high proportion of the amino acid glycine, which has a very small side chain.
2 )
A group of three collagen fibres forms a strong, insoluble coiled structure termed a triple helix.
3 )
Each of the collagen polypeptides in a collagen molecule has a regular spiral arrangement of many alpha helices.
4 )
Peptide bonds are present between amino acids of the same polypeptide and between the different polypeptides forming the collagen molecule.
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