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1.Gluconeogenesis is a metabolic process which produces glucose from the non-carbohydrate substrates.
Labelled carbon dioxide bubbled through the liver cell suspension will react with water and produce bicarbonate ion which is being utilized in the first step of gluconeogenesis. Here (reaction 1 given below) utilizing ATP, the labelled carbon of bicarbonate reacts with pyruvate and forms the fourth carboxyl group of oxaloacetate. But in the next step, the terminal labelled carboxyl carbon is being removed again as carbon dioxide utilizing GTP to form pyruvate.
Thus, none of the carbon will be C14 labelled in the newly formed glucose from gluconeogenesis.
Concentrations of some glycolysis intermediates in the red blood cell (mM): Glucose Glucose-6-P Fructose-6-P Fructose-1,6-BP 1,3-bisphosphoglycerate...