The reaction of ethanol fermentation is: pyruvate + NADH ? ethanol + CO2 + NAD+. Why would a yeast need to perform this reaction in the absence of oxygen?
A. to produce NAD+ allowing the electron transport chain to run
B. to produce NAD+ allowing glycolysis to continue
C. to consume excess pyruvate that cannot enter the Krebs cycle
D. NADH is necessary to reduce pyruvate to lactate
E. to produce CO2 for respiration
Answer: B
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