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Question

When a yeast cell respires, ATP formed are

A
4
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B
2
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C
6
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D
8
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Solution

The correct option is B 2
Yeast cells undergo anaerobic respiration which produces only 5% of the energy stored in glucose. Yeast cells utilize sugars and convert it into ethanol and carbon dioxide producing only 2 molecules of ATP. This is because, in the absence of oxygen, the partial breakdown of glucose takes place. Since it produces alcohol it is known as alcoholic fermentation.
Thus, the correct answer is option B.

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