* This study forms part of a research program supported by grants from the National Science Foundation, G-7657, and the American Cancer Society Institutional Grnat Im-38-B. The following abbreviations are used in the text and tables: ATP, adenosine triphosphate; ADP, adenosine diphosphate; AMP, adenosine monophosphate; Ad, adenosine; APS, adenosine phosphosulfate; PAPS, 3′-phospho-adenosinephosphosulfate; RNA, ribonucleic acid; AA, amino acid; RNA-AA, 3′-amino acid ester of RNA; Ac, acyl; AMP-Ac, Acyl adenylate; DPN, diphosphopyridine nucleotide; NMN, nicotinamide mononucleotide; Pyro, pyrophosphate; Ortho, orthophosphate; PEP, phosphoenolpyruvate; Pyr, pyruvate; Acetyl·P, acetyl phosphate; Cr·P, creatine phosphate; Cr, creatine; Glyc·2·P, glycerol-2-phosphate.