Amide links R R R R R R CH CH CH H-N′C-OH CH CH H 0H OH 0 H O An a-amino acid a portion of a protien molecular Primary structure: the exact sequence of the different a-amino acids along the protein chain Second and tertiary structure: the folding of the polyamide chain which give rise to higher levels of complexity Although hydrolysis of natural occurring proteins may yield as many as 22 different amino acids, the amino acids have an important structural feature in commonN H H CH C O OH R N H CH C O R N H CH C O R' N H CH C O R'' N H CH C O R'''' N H CH C O R''' Amide links An -amino acid A portion of a protien molecular Primary structure: the exact sequence of the different α-amino acids along the protein chain. Second and tertiary structure: the folding of the polyamide chain which give rise to higher levels of complexity. Although hydrolysis of natural occurring proteins may yield as many as 22 different amino acids, the amino acids have an important structural feature in common