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colleen colleen
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13 years ago
Explain why the ATP yield from processes such as cellular respiration is generally given as a theoretical number.
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Sunshine ☀ ☼

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#1
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13 years ago
The maximum yield of ATP from a single molecule of glucose is 38 ATP molecules. However, any given glucose molecule may produce fewer than this number of ATP molecules for a variety of reasons. A eukaryotic cell spends 2 ATP molecules in transporting NADH produced during glycolysis into the mitochondrion; this reduces the theoretical yield to
Tawnyads
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#2
13 years ago
!
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#3
13 years ago
The theoretical efficiency of 36 ATP per glucose is not actually met. Because the inner mitochondrial membrane is not completely imprmeable to H+ ions, some lack back in to the matrix, reducing the number that go through the ATPase complex to produce ATP. In addition, some of the H+ in the intermembrane space are used for other energy requiring activites, and are thus not available for ATP production. It is estimated that the actual yield of ATP is about 30 ATP/glucose.
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