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How many steps of decarboxylation lead to the formation of ketoglutaric acid?(a) One(b) Three(c) Two(d) SevenThis question was posed to me during an internship interview.This is a very interesting question from Aerobic Respiration topic in portion Respiration in Plants of Biology – Class 11

Answer»

Correct OPTION is (C) Two

For explanation I would say: Two steps of DECARBOXYLATION leads to the formation of ketoglutaric acid. When citric acid is FORMED in the cycle, it then forms cis-acotinic acid and then isocitric acid. Isocitric acid further forms oxalosuccinic acid which FINALLY forms ketoglutaric acid in the presence of oxalosuccinate decarboxylase enzyme.



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