Pyridoxal phosphate acts as a coenzyme that helps convert one of these molecules to pyruvate in a reaction (-5[1])with alpha-ketoglutarate. A compound (10[1])consisting of (10[1])three of these molecules comprises a resin used in a pulldown assay to purify molecules that are fused to an S-transferase. (-5[1])The SECIS (-5[1])element directs the production of a variant of one of these molecules (-5[1])that incorporates selenium. (10[2])These (10[1])molecules, whose (10[1])D-configuration is (10[1])rarely (10[1]-5[1])found in nature, (10[3])are plotted by their (10[1])phi (10[1])and psi (10[5]-5[1])dihedral (10[1])angles (10[1])on a (10[1])Ramachandran plot. (10[1])Bonds between these molecules (10[1])are cleaved by trypsin. (10[3]-5[1])These molecules, which are differentiated by their side chains, (10[1]-5[1])are carried (10[3])by tRNAs (10[2])during (10[1])translation. (10[5])For 10 points, (10[1])histidine and proline (10[3])are “essential” (10[2])examples (10[1])of what molecules (10[1])that make up proteins? (10[3])■END■ (10[5])