The steps in the electron transport chain in anaerobic respiring bacteria, and the fermentation pathway in fermenting bacteria both: Produce ATP. Produce Ethanol. Produce NADH. Generate a proton gradient. Regenerate NAD^+. Solution Answer: Produce ATP Anaerobic respiration is a process without oxygen and uses a respiratory electron transport chain but does not use oxygen as the electron acceptors and generates only two molecules of ATP. It also produces ethanol or lactic acid Fermentation (alcholic and lactic acid fermentation) occurs in bacteria that convert sugars into acids, alcohol, or gases. In the presence of O2, NADH and Pyruvate are used to generate the ATP.