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Unformatted text preview: . 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. Polypeptides Two or more amino acids bonded together are called a peptide . A chain of many amino acids is referred to as a polypeptide . The complete product, either one or more chains of amino acids, is called a protein . There is unequal sharing of electrons in a peptide bond. The O and the N are negative and the H is positive. Levels of structure The large number of charged atoms in a polypeptide chain facilitates hydrogen bonding within the molecule, causing it to fold into a specific 3-dimensional shape. The 3-dimensional shape is important in the activity of a protein....
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