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What are the end products in ethanol fermentation?

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What are the end products in ethanol fermentation?

(a) Ethanol and CO2

(b) Ethanol and O2

(c) Ethanol, H2 and CO2

(d) Ethanol, O2 and CO2

I had been asked this question in an internship interview.

This intriguing question comes from Fates of Pyruvate under Anaerobic Conditions: Fermentation in division Principles of Bioenergetics and Glycolysis of Biochemistry

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Correct option is (a) Ethanol and CO2

To explain I would say: Overall equation of ethanol fermentation:

Glucose +2ADP + 2Pi → 2 ethanol + 2CO2 + 2ATP + 2H2O.

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