11. Yeast cells
must produce NAD+ as an end product of alcohol fermentation so that glycolysis
can contine to make a few ATP molecules.
NAD+ is needed as raw material during
one of the intermediate steps of glycolysis. It accepts the energized electrons
and hydrogen ions from the original glucose in steps which occur before any
ATP is produced. If NAD+ is present, glycolysis continues to make ATP. If NAD+
isn't present, glycolysis shuts down and the yeast cell loses its source of
ATP and would soon die!
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Slichter