Which of the following ketoacids provides the carbon skeleton for an amino acid capable of carrying 2 atoms of nitrogen per molecule from other tissues to the liver and kidney via the blood?

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Alpha-ketoglutarate is the ketoacid that provides the carbon skeleton for glutamate, which can be converted to glutamine. Glutamine carries two nitrogen atoms and transports them from peripheral tissues to the liver and kidneys.  α-Ketoglutarate is capable of accepting 2 moles of ammonia, first via the action of glutamate dehydrogenase yielding glutamate and then via glutamine synthetase yielding glutamaine. Glutamate plays the central role in mammalian nitrogen flow, serving as both a nitrogen donor and nitrogen acceptor. Glutamine is the nitrogen repository found in the circulatory system. Its role there is to carry ammonia to and from various tissues but principally from peripheral tissues to the kidney.

Which of the Following Ketoacids Provides the Carbon Skeleton for an Amino