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Question

When one molecule of glucose is completely oxidized into CO2 and H2O, How many ATP are generated by proton gradient?

A
36 or 38
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B
38 or 40
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C
34 or 32
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D
36 or 34
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Solution

The correct option is C 34 or 32
The electron transport chain is a series of proteins and organic molecules found in the inner membrane of the mitochondria. Electrons are passed from one member of the transport chain to another in a series of redox reactions. Energy released in these reactions is captured as a proton gradient, which is then used to make ATP in a process called chemiosmosis. Together, the electron transport chain and chemiosmosis make up oxidative phosphorylation.
The maximum ATP yield for a molecule of glucose generated by proton gradient is around 32-34 ATP as ATP : NADH and ATP : FADH2 ratios during the oxidative phosphorylation appear to be 2.5 and 1.5 rather than 3 and 2 respectively. .

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