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Biology LibreTexts

1: The Cell Cycle

  • Page ID
    42778
    • 1.1: The Cell Cycle and Changes in DNA Content
    • 1.2: Bacterial Cell Division and the Eukaryotic Cell Cycle
      The life of actively growing bacteria is not separated into a time for duplicating genes (i.e., DNA synthesis) and one for binary fission (dividing and partitioning the duplicated DNA into new cells). Instead, the single circular chromosmome of a typical bacterium is replicating even before fission is complete, so that the new daughter cells already contained partially duplicated chromosomes. Cell growth, replication and fission are illustrated below.
    • 1.3: Regulation of the Cell Cycle
      Progress through the cell cycle is regulated. The cycle can be controlled or put on ‘pause’ at any one of several phase transitions. Such checkpoints monitor whether the cell is on track to complete a successful cell division event. Superimposed on these controls are signals that promote cell differentiation.

    Thumbnail: Life cycle of the cell. (CC BY-SA 4.0; BruceBlaus).

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