Number one is we want to trap that glucose in the cytoplasm of that cell. So by adding that phosphoryl group onto carbon number six, we change the structure of this glucose molecule, we transform it into glucose six phosphates. So what we do is we basically make it much more polar because now it contains a full negative charge, in fact a negative charge of two, whereas in this case it wasn't as polar because it didn't contain a full charge. 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.