Which step in glycolysis involves the process where isomerization takes place? which step in glycolysis involves the process where isomerization takes place? 1,3-bisphosphoglycerate to 3-phosphoglycerate fructose-1,6-bisphosphate to dihydroxyacetone phosphate glucose-6-phosphate to fructose-6-phosphate and dihydroxyacetone phosphate to glyceraldehyde-3-phosphate fructose-6-phosphate to fructose-1,6-bisphosphate and 1,3-bisphosphoglycerate to 3-phosphoglyc?