Which features of collagen result in it having high tensile strength?
1 Bonds form between adjacent molecules.
2 Each three-stranded molecule is held together by hydrogen bonds.
3 Every third amino acid in the polypeptide is small.
4 The primary structure is held together by peptide bonds.
1, 2 and 3
2 )
1, 3 and 4
3 )
1 and 2 only
4 )
2, 3 and 4
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