Problem: Some cells undergo glycolysis, producing 2 ATP, and then perform fermentation reactions instead of the electron transport chain when final electron acceptors are scarce. The fermentation reactions produce acids and alcohols. What purpose do these fermentation reactions serve to the cell? Question options: 1) Create additional ATP from the fermentation reactions 2) Create hydrogens that will fuel the electron transport chain 3) acids and alcohols that are used by the microbes as carbon sources 4) Regenerate NAD+ from NADH during the fermentation reactions so that the cell can perform more glycolysis to generate ATP 5) Create breakdown products of glucose that can enter the Kreb cycle