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  4. In the hexose monophosphate shunt pathway, the number of CO2 molecules evolved is .

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Q. In the hexose monophosphate shunt pathway, the number of CO2 molecules evolved is _________.

NTA AbhyasNTA Abhyas 2020Respiration in Plants

Solution:

Carbon dioxide evolved in HMP is higher than glycolysis. In this cycle for every molecule of CO2 released 2 NADPH2 are synthesized. Therefore, the complete oxidation of one glucose molecule would produce 6 CO2 molecules or $\left(6 \times 2\right)=12$ NADPH2 molecules.
Since each NADPH2 on its passage through the electron transport chain yields 3ATP, therefore, 12 NADPH2 would yield $\left(\right.12\times 3\left.\right)=36$ ATP molecules.
Net gain of ATP is 36 -1 = 35 ATP