already studying for next semester's classes Sources Lamp Science and John Liebler Art of the Cell "The mitotic phase is usually the shortest part of any cell cycle. The largest portion of the cell cycle, interphase, makes up 90% of a cell's life cycle and is the stage for growing and performing the cellular functions specific to that cell. The interphase is further divided into two G phases- G1 and G2- and an S phase. During these phases, the cell grows by producing various proteins and cytoplasmic organelles. During the S phase, the cell replicates its genome in preparation for cell division or mitosis. Mitosis occurs during the M phase, which occurs after interphase. Mitosis is conventionally divided into 5 phases: prophase, metaphase, anaphase and telophase, and cytokinesis. In interphase, a nuclear envelope surrounds the nucleus, the DNA is replicated in the S phase, and the sister chromatids join together at the central portion of the chromosome - the centromere. To organize the chromosome motion in the cell to help make division efficient as well as ensure all material is present in both daughter cells, the cell has centrosomes at each pole of the cell. Centrosomes organize the fibers of the mitotic spindle during mitosis, that will help pull the sister chromatids apart."
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