<prompt> All of the following steps act as sources of energy in citric acid cycle except -Citrate synthaseIsocitrate dehydrogenaseSuccinyl thiokinaseSuccinate dehydrogenase  <response>: Ans. is a i.e., Citrate synthase The total number of ATPs obtained in citric acid cycle is 10.S.NOENZYMEREDUCING EQUIVALENTATP EQUIVALENT1Isocitrate dehydrogenase1NADH2.52a ketoglutarate dehydrogenase1 NADH2.53Succinyl CoAATPGTP14Succinate dehydrogenaseFADH21.55Malate dehydrogenaseNADH2.5Total 10 Hence citric acid cycle uses NAD, FAD, ADP and GDP. It does not use NADP as its coenzyme 