Polypeptides are peptide chains synthesized from up to approximately 50 amino acids.

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A peptide bond is a covalent chemical bond formed when the carboxylic acid group of one amino acid reacts with the amine group of another, releasing a water molecule in a dehydration synthesis process.

Peptide bonds

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Peptides are molecules formed by chemically linking relatively small numbers of amino acids, approximately 50 or fewer, via peptide bonds. They are often designated with prefixes based on their size, such as dipeptides (two amino acids) and tripeptides (three amino acids).

Peptides

Oligopeptides are peptide chains formed by linking up to approximately 20 amino acids.

Oligopeptides

Polypeptides

During peptide bond formation between two alanine molecules, the hydroxyl ($$-\text{OH}$$) group from the carboxylic acid of one alanine and the hydrogen ($$-\text{H}$$) from the amino ($$-\text{NH}_2$$) group of the other alanine react to release a water molecule. This dehydration synthesis process links the two alanine molecules via a peptide bond.

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