Collagen is a macromolecule with three polypeptides lying closely side by side in the form of a triple helix.
Every third amino acid in each polypeptide has the shortest possible R-group or side chain (– H) to allow close packing of the polypeptides.
Which is the amino acid?
1 )
glucose
2 )
glycerol
glycine
4 )
guanine
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