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1. Changes in dry weight, protein, RNA and DNA were measured in yeast during adaptation to glycolytic metabolism. 2. Only RNA increased significantly during the lag phase, but during the exponential phase all these cellular components increased in parallel. 3. The concentrations of ATP, ADP, AMP and glucose 6-phosphate were measured in respiring yeast and during the transition to glycolytic metabolism. 4. In respiring cells the concentration of AMP was at its highest and that of ATP was at its lowest; this relationship was reversed in glycolysing cells. 5. ADP concentration was similar in respiring and glycolysing cells, but glucose 6-phosphate concentration was much higher in the glycolysing cells. 6. A possible reason for mitochondrial repression is suggested. 7. It is concluded that adenosine phosphates do not control the direction of glycolytic flux in yeast and an alternative control of glycolysis and gluconeogenesis by enzyme activation and inactivation is suggested.

Adenosine phosphates and the control of glycolysis and gluconeogenesis in yeast