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Q. The first $5C$ dicarboxylic acid in Krebs' cycle which is used in nitrogen metabolism is

Respiration in Plants

Solution:

The first 5 carbon dicarboxylic acid in Krebs' cycle is $\alpha$ ketoglutaric acid. The $\alpha$-ketoglutarate that accumulates when $\alpha$-ketoglutarate dehydrogenase is inhibited can be used in nitrogen metabolism as a precursor for several amino acids and the purine bases.
$\alpha$-ketoglutarate $\to$ Glutamate Other amino acids $\to$ Purines.
$\alpha$-ketoglutarate of Krebs' cycle produces an important amino acid called glutamate on amination.