Most of a cell's time is spent in interphase. Even though it may seem that during interphase the cell is relaxed, this is really not the case because the cell is going through the G1, S, and G2 phases in preperation for division. In the G1 phase, the cell is increasing the number of it's proteins and organelles and growing in size. In S, DNA replication occurs and the chromosomes double to form sister chromatids. The G2 phase also performs protein synthesis.

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