The connection of amino acids occurs due to the cleavage of the OH group from the carbon atom of the carboxyl group of one amino acid and the hydrogen atom from the amino group of another, as a result of which it becomes possible to form a covalent bond between the carbon and nitrogen atoms of these groups:
NH2-CH (C3H7) -C (0) -NH-CH2-COOH.
Peptide group: ~ C (0) —NH—
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