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Question

Formation of alcohol by yeast is

A

Anaerobic process

B

Extracellular

C

Microbial

D

All of the above

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Solution

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Sugars are the ultimate source for yeast. It converts the sugar into pyruvate by the process of glycolysis. Under anaerobic condition, the pyruvate is reduced to acetaldehyde and finally to ethanol and carbon dioxide as waste products. It is an extracellular process which produces two ATP.
So, the correct answer is option D.

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