Roughly what proportion of the energy contained in glucose is extracted by the pathways of glucose catabolism in living systems?
AAbout 14 percent
BAbout 24 percent
CAbout 34 percent
DAbout 44 percent
Answer & Solution
Correct answer: C. About 34 percent
1. Real cells are messier than an idealised pathway, since intermediates are drawn off for other uses.
2. Overall, in living systems, these pathways extract about 34 percent of the energy contained in glucose.
3. The remainder is not captured in adenosine triphosphate.
4. The word about matters, because the figure is an approximation rather than a fixed constant.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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