Peptide bonds connect amino acids into linear un-branched chains (a) (b) H H HH O H HH *HgN- -++HN一 HaN-CC-N-C.C-N-C7 ,C-N-C。C-N-C。 R H R O R3 H R.O Rs Amino end Carboxyl end (N-terminus】 (C-terminus) >H20 Formed by a condensation reaction between the -NH2 Peptide (amido)group of one amino bond acid and the-COOH(carboxyl) group of another. Peptide bonds connect amino acids into linear un-branched chains Formed by a condensation reaction between the -NH2 (amido) group of one amino acid and the –COOH(carboxyl) group of another