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+
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1
Understand the process of glycolysis: Glycolysis is the first step in cellular respiration where glucose is broken down into two molecules of pyruvate, producing a net gain of 2 ATP and 2 NADH molecules.
Recognize the role of fermentation: In the absence of oxygen, cells undergo fermentation to continue producing ATP. Fermentation allows glycolysis to continue by regenerating NAD+ from NADH.
Identify the extra step in fermentation: This step involves the reduction of pyruvate to either lactate (in lactic acid fermentation) or ethanol and carbon dioxide (in alcoholic fermentation).
Connect the extra step to NAD+ regeneration: The reduction of pyruvate to lactate or ethanol allows NADH to be oxidized back to NAD+, which is essential for glycolysis to continue.
Conclude the purpose of the extra step: The primary function of this step is to recycle NADH to NAD+, enabling the cell to maintain glycolysis and continue producing ATP in anaerobic conditions.