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 D-configuration is rarely found in nature, are plotted by their phi and psi dihedral angles 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 translation. For 10 points, histidine and proline are “essential” examples of what molecules that make up proteins? ■END■
ANSWER: amino acids [accept AAs; prompt on proteins or polypeptides or residues; prompt on specific amino acids like alanine or cysteine or selenocysteine or histidine or proline before read by asking “what type of molecule is that?”]
<Biology>
= Average correct buzz position