Fermentation is essentially glycolysis plus an extra step in which pyruvate is reduced to form lactate or alcohol and carbon dioxide. This last step __________.
A
removes poisonous oxygen from the environment
B
extracts a bit more energy from glucose
C
prevents pyruvate from accumulating
D
enables the cell to make pyruvate into substances it can use
E
enables the cell to recycle the reduced NADH to oxidized NAD+