So basically the process of interface is the first stage of the life cycle of an animal cell. Interface consists of the G one phase, the S phase and the G two phase. In the G one phase the cell basically grows in size because the majority of the proteins and organelles are synthesized within our cell. The S phase is based basically the replication phase. This is when the cell actually replicates the DNA. Now the last phase, the G two phase this is the phase in which the cell basically makes sure that the cell is prepared for the process of cell division.