After the cell division has been completed, the salvage enzymes, no longer required, are degraded. During interphase the cell derives its requirement of nucleoside-5'-phosphates by de novo synthesis, that leads directly to the 5'-monophosphate nucleotides.
After cell division, the salvage enzymes are broken down, and during interphase, cells synthesize their own nucleoside-5'-phosphate requirements to create 5'-monophosphate nucleotides.