Amino acids are mostly synthesised from
(a) mineral salts
(b) fatty acids
(c) volatile acids
(d) a-ketoglutaric acid.
The answer is (d) a-ketoglutaric acid.
The process of synthesis of aminoacids in living oragnams is mainly due to Transamination. During this transamination one amino group transfers form Glutamic acid to a organic acid, the glutamic acid turns in to a-ketoglutaric acid and that organic acid turns in to amino acid. Later a-ketoglutaric acid undergoes transamination and converts again into glucatimic acid.
Glutamic acid + Oxalo acetic acid <===> aspratic acid + a-ketoglutaric acid
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