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Question

The first phase in the breakdown of glucose in animal cell is

A
Glycolysis
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B
Electron transport system
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C
Fermentation
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D
Krebs cycle
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Solution

The correct option is A Glycolysis
In glycolysis, glucose (a six carbon sugar) is split into two molecules of a three carbon sugar. Glycolysis yields two molecules of ATP, two molecules of pyruvic acid and two electron carrying molecules of NADH. Glycolysis is the first stage of cellular respiration. It occurs in absence of oxygen. It is common in aerobic and anaerobic respiration.

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