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lpp06
I think the key is in the answer phrasing, the answer mentioning H-bonds says "Disruption of H-bonds between collagen molecules"
Although collagen does undergo H-bonding to support the triple helix, this is done within the same collagen molecule.
Linking different collagen molecules occurs via the lysine - hydroxylysine links done in the ECM
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kevin
this is the one comment that finally helped me understand why that was incorrect. thank you
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Subcomments ...
I might be overthinking it but, H bond formation of aa's makes the secondary structure of the protein (collagen in this case). The Gly to Ala substitution does result in less H bond formation, but of individual aa's not between collagen molecules (that might be more for quaternary structure)