DIY Glycolysis

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Step Seven - Phosphoryl Shift on Glyceraldehyde 1,3-bisphosphate

Possible, Desirable but This is Done Later.

That is actually a good idea because later you will want to remove a hydroxyl group from carbon 3 - tricky to do if there is a phosphate group stuck on it! However, in glycolysis the shift of phosphate from carbon 3 to carbon 2 is done at a later stage. Sorry! (There may be a good reason why the pathway has evolved this way.)