Answer: If 14CO2 is bubbled through a suspension of cells undergoing conversion from Lactate to glucose, then none of the carbons would be radioactive. External C02 is not required in the conversion of lactate to glucose. Hence 14CO2 won\'t be incorporated in any carbon. Solution Answer: If 14CO2 is bubbled through a suspension of cells undergoing conversion from Lactate to glucose, then none of the carbons would be radioactive. External C02 is not required in the conversion of lactate to glucose. Hence 14CO2 won\'t be incorporated in any carbon..