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Section 5-1 Cell Cycle Section 5-1 Cell Cycle Write everything that is underlined.

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Presentation on theme: "Section 5-1 Cell Cycle Section 5-1 Cell Cycle Write everything that is underlined."— Presentation transcript:

1 Section 5-1 Cell Cycle Section 5-1 Cell Cycle Write everything that is underlined

2 5.1 The Cell Cycle KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions

3 5.1 The Cell Cycle The cell cycle has four main stages The cell cycle is a regular pattern of growth, DNA replication, and cell divisionThe cell cycle is a regular pattern of growth, DNA replication, and cell division

4 5.1 The Cell Cycle The main stages of the cell cycle are gap 1, synthesis, gap 2, and mitosisThe main stages of the cell cycle are gap 1, synthesis, gap 2, and mitosis –Gap 1 (G 1 ): cell growth and normal functions –DNA synthesis (S): copies DNA –Gap 2 (G 2 ): additional growth –Mitosis (M): includes division of the cell nucleus (mitosis) and division of the cell cytoplasm (cytokinesis)

5 5.1 The Cell Cycle Mitosis occurs only if:Mitosis occurs only if: –the cell is large enough –and the DNA is undamaged If the DNA is damaged, the cell commits suicide – so it doesnt pass on bad DNAIf the DNA is damaged, the cell commits suicide – so it doesnt pass on bad DNA

6 5.1 The Cell Cycle Cells divide at different rates. The rate of cell division varies with the need for those types of cells.The rate of cell division varies with the need for those types of cells. Some cells are unlikely to divide (G 0 ).Some cells are unlikely to divide (G 0 ).

7 5.1 The Cell Cycle Why divide? Cell size is limited. Volume increases faster than surface areaVolume increases faster than surface area

8 5.1 The Cell Cycle Surface area must be big enough to allow for adequate exchange of materials (nutrients, wastes)Surface area must be big enough to allow for adequate exchange of materials (nutrients, wastes) –Cells that must be large have unique shapes


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