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 (-5[1])element directs the production of a variant of one of these molecules (-5[1])that incorporates selenium. (10[1])These molecules, whose D-configuration is rarely found in nature, are plotted by their (10[1])phi and psi dihedral (10[1])angles on a Ramachandran plot. (10[1])Bonds between these molecules (10[1])are cleaved by trypsin. (10[1])These molecules, which are differentiated by their side chains, (10[1])are carried (10[1])by tRNAs during translation. (10[1])For 10 points, histidine and proline (10[1])are “essential” examples of what molecules that make up proteins? (10[1])■END■