Net ATPs produced by substrate level phosphorylation when one molecule of fructose is conveed to two molecules of pyruvate?
ATP yield of fructose is same as that of glucose. One may argue that fructose enters glycolysis bypassing the energy investment step (fructose-1-phosphate to fructose 1,6 bisphosphate) and thus 1 ATP should be obtained extra. but one extra ATP is used for conversion of glyceraldehyde to GAP. So ATP consumption (total 2 per fructose) is same as glycolysis of glucose. Look at the ATP used in the image when fructose enter glycolysis. Hence Net ATP yield is also 4 ATP produced- 2 ATP used = 2 ATPs
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Galactose and fructose metabolism