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(A) The oxidation of amino acids via the amphibolic pathway involves their conversion into intermediates of the $Krebs$ cycle (e.g.,$Pyruvate$,$Acetyl

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$1$

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(A) The oxidation of amino acids via the amphibolic pathway involves their conversion into intermediates of the $Krebs$ cycle (e.g.,$Pyruvate$,$Acetyl-CoA$,$\alpha-Ketoglutarate$).When an amino acid enters the $Krebs$ cycle,it undergoes reactions that produce $ATP$ (or $GTP$) via substrate-level phosphorylation.Specifically,the conversion of $Succinyl-CoA$ to $Succinate$ in the $Krebs$ cycle results in the formation of one molecule of $GTP$,which is equivalent to one $ATP$.Therefore,for one molecule of amino acid oxidized through this pathway,$1$ substrate-level $ATP$ is formed.

How many substrate-level $ATP$ molecules are formed if one molecule of amino acid is oxidized via the amphibolic pathway?

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