The three carbons in lactate and alanine have identical oxidation states, and animals can use either carbon source as a metabolic fuel. Compare the net ATP yield (moles of ATP per mole of substrate) for the complete oxidation (to CO2 and H2O) of lactate versus alanine when the cost of nitrogen excretion as urea is included.

Biochemistry
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Chapter1: Biochemistry: An Evolving Science
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The three carbons in lactate and alanine have identical oxidation states, and animals can use either carbon source as a metabolic fuel. Compare the net ATP yield (moles of ATP per mole of substrate) for the complete oxidation (to CO2 and H2O) of lactate versus alanine when the cost of nitrogen excretion as urea is included. 

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