<prompt> True about electron transport chaina FADH gives 2 ATPb Entry point of NADH is at complex IIc NADH gives 3 ATPd FADH gives 3 ATPe NADH enters the step 1 of cycleacebcbcdae  <response>: NADH enters the step 1 of cycle FA gives 2 ATP NADH gives 3 ATPNADH enters the ETC at complex I and FADH2 enters the ETC at complex II.According to old calculations one molecule of NADH produces 3 ATPs and molecule of FADH2 produces 2 ATP molecules. However, in recent studies it has been proved that NADH produces 2.5 ATPs and FADH2 produces 1.5 ATP s. 