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Cells

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Year 8 Cells - For additional resources visit: http://www.iheartscience.net

Year 8 Cells - For additional resources visit: http://www.iheartscience.net

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  • 1. Cells Sarah Jones
  • 2. The Discovery of Cells In the seventeenth century, Robert Hooke looked at thin slices of cork under a microscope that he had made from lenses. He observed small box-like shapes inside the cork. He called the little boxes that he saw cells. marshscience7.blogspot.com
  • 3. Under the five kingdom system cells can be divided into two basic types.
  • 4. Prokaryotic cells - simple cells without distinct membrane bound organelles or nucleus.
  • 5. Eukaryotic cells - more complex with membrane bound organelles and nucleus.
  • 6. Animal Cell
  • 7. • Exist as part of a multicellular organism. • Specialisation of cells into many types (cell differentiation). • Possess nucleus and membrane bound organelles. • Many different types.
  • 8. Plant Cell
  • 9. • Exist as part of a multicellular organism. • Specialisation of cells into many types (cell differentiation). • Possess nucleus and membrane bound organelles.
  • 10. Plant vs Animal Plant and animal cells have many similarities because they are both eukaryotic. They also have some differences:
  • 11. Parts of a Generalised Animal Cell
  • 12. Nucleus • Contains the chromosomes (genetic information) for the cell. • Controls the activities of the cell.
  • 13. Mitochondria • Double membrane - outer membrane and inner membrane. • Inner membrane is folded forming cristae. • The interior contains an organic matrix containing chemical compounds. • Site of aerobic respiration.
  • 14. Rough Endoplasmic Reticulum • A membrane system of flattened parallel cavities which are interconnected and covered with ribosomes. • An intracellular transport system.
  • 15. Golgi Apparatus • Consists of a stack of flattened cavities which package substances produced by the cell into vesicles. • These vesicles can fuse with the cell membrane (exocytosis) or become lysosomes (digestive vesicles).
  • 16. Plant Cell Walls • The main component of plant cell walls is cellulose. • Cellulose molecules are arranged in bundles called microfibrils. • The function of the plant cell wall is to provide strength and support the plant.
  • 17. Prokaryotic organisms are commonly called bacteria. They are cells with a simple structure. They have no membrane around the nucleus and lack any membrane bound organelles.
  • 18. Blue-green bacteria make their own food by photosynthesis.
  • 19. Cell Division