And so what that means is those membrane transport proteins that were able to actually move the glucose into the cell or out of that cell cannot bind the glucosex phosphate because of this charged component. And so these glucose molecules cannot leave the cytoplasm, cannot exit the cell and that means they are trapped inside the cell. Now the second reason for step one is to basically begin destabilizing that glucose molecule. So remember, whenever we have charge that destabilize the structure and in this particular case we have no charge, in this case we have a charge of negative two. So that means this molecule is higher in energy, less stable and more reactive than this glucose. And that's important in basically destabilizing that structure so that in step two it is able to actually react and break down into smaller components.