α-helix, β-sheet, or random coil structures Primary structure refers to Secondary structure refers to created by Tertiary structure refers to Primary structure is determined by the primary structure whereas secondary and tertiary structures are detmied by Primary the sequence of codons in the mRNA structure is stabilized by between whereas secondary structure is stabilized by between while tertiary structure is stabilized by amino and carboxyl groups of amino acids non-covalent, hydrogen bonds folding of small segments of the polypeptide amino and carbonyl groups of peptide bonds non-covalent and covalent bonds between chemical groups on side chains of the amino acids the overall three dimensional structure of the entire polypeptide the amino acid sequence of a polypeptide covalent, peptide bonds