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1.6 Cell Division. Cell Cycle Interphase Mitosis Cyclins Tumours. Cell Cycle. 3 Stages of Cell's Life Cycle Interphase Mitosis (division of nucleus) Cytokinesis (division of cytoplasm). Interphase. Three phases of Interphase G 1 : cell grows, DNA transcribed, protein synthesised

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1 6 cell division

1.6 Cell Division

Cell Cycle

Interphase

Mitosis

Cyclins

Tumours

cell cycle
Cell Cycle

3 Stages of Cell's Life Cycle

  • Interphase
  • Mitosis (division of nucleus)
  • Cytokinesis (division of cytoplasm)
interphase
Interphase

Three phases of Interphase

  • G1: cell grows, DNA transcribed, protein synthesised
  • S : DNA is replicated
  • G2 : Cell prepares for division
cyclins
Cyclins
  • Cyclins are compounds that are involved in the control of the cell cycle.
  • Cyclins interact with proteins called CDK's (cyclin-dependent kinases) to form enzymes.
  • These enzymes control events such as microtuble formation and chromatid alignment.
primary secondary tumours
Primary & Secondary Tumours
  • Apoptosis: programmed cell death
  • Tumour: unchecked growth
  • Benign tumour: stays
  • Malignant tumour: moves: cancer
  • Primary tumour ->metastasis -> secondary tumour
causes of tumours
Causes of Tumours
  • Mutagens: Physical, chemical, & biological agents that change DNA. (radiation, tobacco smoke)
  • Mutation: DNA changes
  • Carcinogens: cancer causing DNA changes
  • Oncogenes: special genes with potential to cause cancer. May be altered normal genes or abnormally expressed