The cell cycle

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  • Created by: Laura
  • Created on: 01-05-14 11:22
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  • The Cell Cycle
    • Cells do not divide continuously, but undergo a regular cycle of division separated by periods of cell growth
    • Interpahse, which occupies most of the cell cycle and is sometimes known as the resting phase because no division takes place. It is divided into three parts
      • First growth (G1) phase, when the proteins from which cell organelles are synthesised are produced
      • Synthesis (S) phase, when DNA is replicated
      • Second growth (G2) phase, when organelles grow and divide and energy stores are increased
    • Nuclear division, when the nucleus divides either into two (mitosis) or four (meiosis)
    • Cell division, which follows nuclear division and is the process by which the whole cell divides into two or four
    • The length of a complete cell cycle varies greatly amongst organisms. Typically, a mammalian cell takes about 24 hrs to complete a cell cycle of which about 90% is interphase

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