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Unformatted text preview: Twenty of the amino acids are used to make protein. Each has a carboxyl group (COOH) and an amino group (NH 2 ). Each amino acid is different and therefore has its own unique properties. Some amino acids are hydrophobic, others hydrophilic . The carboxyl or amino group may ionize (forming NH 3 + or COO-). The "R" group of some amino acids is nonpolar and the "R" group of some others is polar or it ionizes. Amino acids are joined together by a peptide bond . It is formed as a result of a condensation reaction between the amino group of one amino acid and the carboxyl group of another. Click here to view a web page which shows an animation of the formation of a peptide bond....
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