ALL organisms have glycolysis occurring in their cytoplasm .
At steps 1 and 3 ATP is converted into ADP, inputting energy into the reaction as well as attaching a phosphate to the glucose. Dihydroxyacetone phosphate can be converted into GAP by the enzyme Isomerase. Graphic summary of the glycolysis process. Image from W.H. Freeman and Sinauer Associates, used by permission. Humans cannot ferment alcohol in their own bodies, we lack the genetic information to do so.