Pyridoxal phosphate acts as a coenzyme that helps convert one of these molecules to pyruvate in a reaction with alpha-ketoglutarate. A compound consisting of three of these molecules comprises a resin used in a pulldown assay to purify molecules that are fused to an S-transferase. The SECIS element directs the production of a variant of one of these molecules that incorporates selenium. These molecules, whose (10[1])D-configuration is rarely found in nature, are plotted by their phi and psi (-5[1])dihedral angles (10[1])on a Ramachandran plot. Bonds between these molecules are cleaved by trypsin. These molecules, which are differentiated by their side chains, are carried by tRNAs during (10[1])translation. (10[1])For 10 points, (10[1])histidine and proline are “essential” (10[1])examples of what molecules that make up proteins? (10[1])■END■