Remember, the entire point of stage one is to trap the molecule and make it less stable. So once again, glucose moves into the cell with the help of a membrane transporter. Once inside the cytoplasm, it undergoes a phosphorylation process in which hexokinase adds a phosphate group, phosphoryl group onto the 6th carbon by taking it away from ATP. And we also form the ADP. So actually this step requires energy, requires an ATP molecule. So this step is significant for two reasons.