Which features of collagen result in it having high tensile strength?
1 covalent 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 )
1 and 2
1, 2 and 3
3 )
1, 3 and 4
4 )
2, 3 and 4
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