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1.6 Cell Division

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

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  1. 1.6 Cell Division Cell Cycle Interphase Mitosis Cyclins Tumours

  2. Cell Cycle 3 Stages of Cell's Life Cycle • Interphase • Mitosis (division of nucleus) • Cytokinesis (division of cytoplasm)

  3. Interphase Three phases of Interphase • G1: cell grows, DNA transcribed, protein synthesised • S : DNA is replicated • G2 : Cell prepares for division

  4. Mitosis

  5. 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.

  6. Primary & Secondary Tumours • Apoptosis: programmed cell death • Tumour: unchecked growth • Benign tumour: stays • Malignant tumour: moves: cancer • Primary tumour ->metastasis -> secondary tumour

  7. 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

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