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Question

Number of CO2 molecules liberated during common pathway of respiration is

A
Less than the CO2 molecules liberated during link reaction
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B
More than the CO2 molecules liberated during link reaction
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C
Equal to the CO2 molecules liberated during link reaction
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D
Sometime less and sometime more than the CO2 molecules liberated during link reaction.
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Solution

The correct option is A Less than the CO2 molecules liberated during link reaction
Glycolysis is common to both aerobic respiration and anaerobic respiration. Link reaction is a reaction in which pyruate produced during glycolysis is converted into acetyl CoA. This then enters the Krebs cycle. Number of CO2 molecules liberated during glycolysis are zero. During the conversion of pyruvate into acetyl CoA, 2 molecules of CO2 are produced. Hence, number of CO2 molecules liberated during common pathway of respiration is less than the CO2 molecules liberated during link reaction.
Thus, the correct answer is 'Less than the CO2 molecules liberated during link reaction.'

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