During which process is ethanol produced?
a-lactic acid fermentation
b-alcohol fermentation
c-citric acid cycle
d-electron transport chain

The correct answer would be B-alcohol fermentation.

Alcohol fermentation or ethanol fermentation is a type of anaerobic respiration by which organism (such as yeast) convert sugar such as glucose, sucrose et cetera into ethanol and carbon dioxide in order to produce energy.

First, glucose is converted into 2 molecules of pyruvate by the process of glycolysis. It leads to the formation of 2 molecules of ATP (adenosine triphosphate) and 2 molecules of NADH.

Then, two molecules of pyruvate are converted into two molecules of acetaldehyde with the help of enzyme pyruvate decarboxylase. Two molecules of carbon dioxide are released as a byproduct.

Lastly, two molecules of acetaldehyde are converted into two molecules of ethanol with the help of enzyme alcohol dehydrogenase. It consumes two NADH and regenerates two NAD⁺ lost during the process of glycolysis.

Hence, the net gain of alcohol fermentation is two ATP.

Thus, we can say that ethanol is produced during alcohol fermentation.

During alcohol fermentation ethanol is produced.

Alcohol fermentation involves the break down of sugars in organisms such as yeast to form ethanol or alcohol, carbon dioxide and release energy.

Step 1

Step 2

Keywords: Anaerobic respiration, Fermentation, alcohol fermentation, Glycolysis, steps involved in alcohol fermentation

Level: High school

Subject: Biology

Topic:  Respiration

Sub topic: Alcohol fermentation

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