Which features affect the tensile strength of collagen?
1) the helical structure of collagen chains
2) the small R group of the amino acids in collagen
3) the insoluble nature of collagen
4) the covalent bonds between collagen molecules
1 )
1, 2, 3 and 4
2 )
1 and 3 only
1, 2 and 4 only
4 )
2, 3 and 4 only
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