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As the pH increases, the amino group looses a proton. Proteins are formed by a condensation reaction that joins the amino group of one amino acid with the carboxyl group of another. The resulting bond is a type of covalent bond called a peptide bond.Thus, proteins are also called polypeptides-because they contain oodles of peptide bonds.rimary structure-Refers to the sequence of amino acids in the protein. Once formed, the protein immediately folds and takes on a particular 3D configuration (see below). The shape of the protein is determined by the sequence of amino acids (the primary structure). Let s use pop beads to model a protein.
As both the amine and carboxylic acid groups of amino acids can react to form amide bonds, one amino acid molecule can react with another and become joined through an amide linkage. This polymerization of amino acids is what creates proteins.he alpha amino acids are the most common form found in nature, but only when occurring in the L-isomer. The alpha carbon is a chiral carbon atom, with the exception of glycine which has two indistinguishable hydrogen atoms on the alpha carbon.