<prompt> In Citric acid cycle, which enzyme is inhibited by arsenite-Isocitrate Dehydrogenasea ketoglutarate DehydrogenaseSuccinate DehydrogenaseAconitase  <response>: Ans. is b i.e., a ketoglutarate Dehydrogenase Arsenite binds to the sulfhydryl group and hence inhibits the activity of enzymes which have lipoamide in the active site Hence Arsenite inhibits Pyruvate Dehydrogenase and a ketoglutarate dehydrogenase of citric acid cycle It is an example for non competitive inhibition Succinate dehydrogenase is inhibited by malonate Aconitase is inhibited by fluroacetate. It is an example for suicidal inhibition. 