Final answer:
Non-hydroxylated prolines contribute to collagen stability by conferring rigidity to the collagen molecule and do not disrupt collagen structure.
Step-by-step explanation:
Non-hydroxylated prolines do not have hydroxyl (-OH) groups attached to their side chains, unlike hydroxyprolines. These hydroxyl groups allow more hydrogen bonding in collagen peptides, making connective tissues stronger. Non-hydroxylated prolines contribute to collagen stability by conferring rigidity to the collagen molecule.