The conversion of sugar into carbon dioxide gas ( $C O_{2}$ ) and ethyl alcohol is carried out by yeast cells. What is this process called?

Fermentation

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Moulding

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Nitrogen fixation

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None of the above

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Solution

The correct option is A Fermentation
Fermentation is a metabolic process that converts sugarto acids, gases or alcohol. It occurs in yeast and bacteria, but also in oxygen-starved muscle cells, as in the case of lactic acid fermentation.
$C_{6} H_{12} O_{6} G l u c o s e \to 2 C_{2} H_{5} O H E t h a n o l + 2 C O_{2} C a r b o n D i o x i d e + H e a t$
Fermentation does not require oxygen. If oxygen is present, some species of yeast will oxidizepyruvate completely to carbon dioxide and water.

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Question 2 (f)
The process of conversion of sugar into alcohol is called :

a) nitrogen fixation
b) moulding
c) fermentation
d) infection

The process of conversion of sugar into alcohol by the action of yeast is known as _________.

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