Final answer:
The cell is in the G1 phase of interphase, where it grows and synthesizes proteins in preparation for subsequent division through the S and G2 phases, and finally, the mitotic phase.
Step-by-step explanation:
The cell described in the question is in the G1 phase (first growth phase) of interphase. During this longest stage of the cell's life cycle, the cell grows, synthesizes proteins, and increases in size. It performs its routine functions and metabolic activities at a high rate, preparing itself for DNA replication in the subsequent S (synthesis) phase. If the cell reaches a point where it grows too large and needs to divide, it will move into the next stages of interphase, which include the S phase for DNA replication and the G2 phase for final preparations, before entering the mitotic phase. In the mitotic phase, the nucleus and then the cytoplasm divide to form two genetically identical daughter cells.