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A second amino group is transferred to cituilline from ___________

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A second amino group is transferred to cituilline from ___________

(a) Aspartate

(b) Glutamate

(c) Alanine

(d) Guanine

This question was addressed to me in homework.

Question is taken from Nitrogen Excretion and the Urea Cycle in section Amino Acid Oxidation and the Production of Urea of Biochemistry

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The correct option is (a) Aspartate

To elaborate: The second amino group enters from aspartate generated in mitochondria by transamination and transported into the cytosol.

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