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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.
The chemistry of amino acid side chains is critical to protein structure because these side chains can bond with one another to hold a length of protein in a certain shape or conformation. Charged amino acid side chains can form ionic bonds, and polar amino acids are capable of forming hydrogen bonds.n fact, each gene in cellular DNA contains the code for a unique protein structure. Not only are these proteins assembled with different amino acid sequences, but they also are held together by different bonds and folded into a variety of three-dimensional structures.