What is the entire point of step one? Why do we have to actually add a phosphoryl group onto the glucose molecule? Well, two important reasons. 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.