<prompt> Source of ATP in RBC;s isBeta oxidation of fatty acidsTCA cycleAnaerobic glycolysisGluconeogenesis  <response>: Glycolysis is the only source of energy in erythrocytes. During anaerobic oxygen deficient condition, when one molecule of glucose is conveed to 2 molecules of lactate, there is a net yield of 2 molecules of ATP. 4 molecules of ATP are synthesized by the 2 substrate level phosphorylations steps 6 and 9. But 2 molecules of ATP are used in the steps 1 and 3, hence the net yield is only 2 ATP Table 9.4. The whole reaction is summarized as Glucose 2 Pi 2 ADP -- 2 Lactate 2 ATPRef: DM Vasudevan Textbook of Medical Biochemistry, 6th edition, page no: 93 96 