Irreversible step in citric acid cycle is catalyzed by ?
Ans. is 'c' i.e., a-ketoglutarate dehydrogenase There are two irreversible steps :oxaloacetate to citrate catalysed by citrate (synthase), anda-ketoglutarate to succinyl CoA, catalyzed by a-ketoglutarate dehydrogenase.
Aconitase
Succinate thiokinase
a-ketoglutarate dehydrogenase
Isocitrate dehydrogenase