The stage up to which glycolysis and fermentation have a common pathway is
A
Dihydroxyacetone.
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B
3-phosphoglyceradehyde.
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C
Pyruvate.
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D
Glucose-6-phosphate.
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Solution
The correct option is C Pyruvate. Glycolysis is the first step in the process of respiration. Glycolysis does not consumes any oxygen nor it releases any carbon dioxide. During glycolysis one molecule of glucose is broken into two molecules of pyruvate. The pyruvic acid formed after glycolysis may be completely oxidised into carbon dioxide and water as in aerobic respiration or may be incompletely broken down into ethyl alcohol or lactic acid during fermentation process.