Question

The 5C organic acid intermediate of Krebs cycle that is a key compound in the nitrogen metabolism of the cell is __.

Answer 1

The only 5C-intermediate of Krebs cycle is $\alpha$-ketoglutaric acid. The $\alpha$-ketoglutaric acid is a key compound in nitrogen metabolism of the cell. It accepts an amino group to form glutamic acid. In Krebs cycle $\alpha$-ketoglutaric acid forms succinyl-CoA, which loses the coenzyme A molecule to form succinate.