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Question

When 2 molecules of pyruvic acid forms 2 molecules of lactic acid by anaerobic respiration then

A
One ATP is lost.
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B
Three ATP is lost.
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C
Six ATP is lost.
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D
None of the above.
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Solution

The correct option is C Six ATP is lost.
When two molecules of pyruvic acid are converted to two molecules of lactic acid there is consumption of two molecules of reduced coenzyme NADH. If we assume each molecule of reduced coenzyme NADH is equivalent to 3 ATP molecules, it can be concluded that 6 ATP molecules are consumed in the process.
So, the correct answer is option C.

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