Why? Well, because now our cell can use the fructose six phosphate and the glyceroaldehyde three phosphate and it can undergo the reverse steps of non oxidative phase of the penthouse phosphate pathway because combining these two will allow the cell to actually build the much needed ribose biphosphate molecules which it can then use to build those DNA molecules nucleic acids. So under such conditions when the cell needs the ribose phyphosphate much more than it needs the NADPH molecules, the glucose six phosphate metabolite is converted via the glycolytic pathway into gap glyceroaldehyde three phosphate and fructosex phosphate. And then these molecules are converted via the reverse non oxidative steps of the pentose phosphate pathway into the ribose five phosphate. Now the correct stoichiometric net equation for this particular reaction is given to us here. So we input five glucose six phosphate molecules and we use up a single ATP molecule and we generate six ribose five phosphate molecules, a single ATP molecule and two H plus ions.