Peptide bonds are important in protein because they:

Explanation

A peptide bond forms by condensation between the carboxyl group of one amino acid and the amino group of the next, so it is what creates the polypeptide chain and therefore the primary structure. R groups project from that backbone and determine folding, but the bond itself does not hold them. Oxygen release is a function of haemoglobin's haem group rather than of any peptide bond.