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a
In the second step of alcohol fermentation, acetaldehyde is oxidised by NADH to ethanol
b
Electron transport chain is operated in aerobic respiration but not in fermentation.
c
The two types of usual fermentations are alcohol fermentation and lactic acid fermentation.
d
Excess lactate is gradually carried away by the blood to the liver, where it is converted back to pyruvate by liver cells.
answer is A.
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Detailed Solution
In the second step of alcohol fermentation, acetaldehyde is reduced by NADH to ethanol. This regenerates the supply of NAD+ needed for the continuation of glycolysis.