A peptide bond is the covalent bond between the carboxyl carbon of one amino acid residue and the amino nitrogen of the next. The displayed group shows the usual linkage, with the central carbon–nitrogen connection being the peptide bond. In an intact unbranched chain of amino acid residues, adjacent positions supply peptide bonds. Cutting one internal peptide bond produces two fragments; merely changing the chain's shape need not cut it. See Clark, Douglas and Choi, Biology 2e: peptide bonds and protein structure.
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A peptide bond is a type of covalent bond that forms between two amino acids during protein synthesis. This bond occurs when the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water (this process is known as a dehydration synthesis or condensation reaction). Once formed, the peptide bond creates a dipeptide, and as more amino acids join in the same fashion, polypeptides and proteins are formed.