Which description of collagen is correct?
1 )
A collagen molecule consists of three polypeptide chains, each in the shape of a helix. The three chains are wound together into a triple helix called a fibre.
2 )
A collagen molecule consists of three polypeptide chains, each of which is an -helix. The three chains are wound tightly together into a triple helix. Many of these triple helices bind together as a fibre.
3 )
A collagen molecule consists of three polypeptide chains wound tightly into a triple helix called a fibre.
A collagen molecule consists of three polypeptide chains in which every third amino acid is glycine. The three polypeptides are wound tightly together into a triple helix. Many of these helices form a fibre.
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