Overview Peptide bond formation carboxyl group on one amino acid + amino group on another amino acid login to view 1 more bullet bond can be broken (hydrolyzed) with addition of water across the bond Orders of protein shape primary amino acid sequence determined by login to view 1 more bullet secondary stable folding of individual protein domains login to view 1 more bullet common forms login to view 1 more bullet determined by login to view 1 more bullet tertiary shape of protein as a whole which imparts functionality to a protein login to view 1 more bullet common forms login to view 1 more bullet determined by login to view 1 more bullet quaternary combination of tertiary sub-units examples login to view 1 more bullet