1.4 The Cell Cycle (Page 40) Cells within the human body have finite life spans. The cell cycle controls the production (through interphase, mitosis,

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1.4 The Cell Cycle (Page 40) Cells within the human body have finite life spans. The cell cycle controls the production (through interphase, mitosis, and cytokinesis) of new cells of a variety of different types. Interphase – periods of growth in the life of a cell; consists of two growth stages and a stage of DNA replication Copyright © 2010 McGraw-Hill Ryerson Ltd.

Cell Cycle Checkpoints (Page 41) Cell Cycle Checkpoints – a point in the life of a cell when proteins determine whether cell division should or should not occur Copyright © 2010 McGraw-Hill Ryerson Ltd.

Cell Death and Suicide Cells “die” when they are damaged due to: (Page 42) Cells “die” when they are damaged due to: exposure to toxic chemicals or conditions physical forces the wear and tear of daily use Cell “suicide” occurs when the cell experiences a “pre-programmed death” due to: “suicide” genes code for proteins that kill the cells in specific situations. cell contents are packaged for use by other cells Copyright © 2010 McGraw-Hill Ryerson Ltd.

Cancer and the Cell Cycle (Pages 43-44) Tumour – an abnormal clump of cells formed when cells divide repeatedly and excessively Cancer – cells with abnormal genetic material that are dividing uncontrollably and can spread to other parts of the body Copyright © 2010 McGraw-Hill Ryerson Ltd.

Concepts to be reviewed: Section 1.4 Review (Page 45) Concepts to be reviewed: the stages of the cell cycle the function of cell cycle checkpoints cell death and cell suicide cancer and how it is related to the cell cycle Copyright © 2010 McGraw-Hill Ryerson Ltd.