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Cells
 

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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    Cells Cells Presentation Transcript

    • Cells Sarah Jones
    • The discovery of cells In the seventeenth century, Robert Hooke looked at thin slices of cork under a microscope that he had made himself from lenses. He observed small box-like shapes inside the cork. He called the little boxes that he saw cells.
    • Types of Living Things Under the five kingdom system cells can be divided into two basic types. Prokaryotic cells - simple cells without distinct membrane bound organelles or nucleus. Eukaryotic cells - more complex with membrane bound organelles and nucleus.
    • Kingdoms
    • Animal Cells Exist as part of a multicellular organism. Specialisation of cells into many types (cell differentiation). Possess nucleus and membrane bound organelles. Many different types.
    • Animal Cell
    • Plant Cells Exist as part of a multicellular organism. Specialisation of cells into many types (cell differentiation). Possess nucleus and membrane bound organelles.
    • Plant Cell
    • Plant Vs Animal Plant and animal cells have many similarities because they are both eukaryotic. They also have some differences:
    • Parts of a Generalised Animal Cell
    • Nucleus - contains the chromosomes (genetic information) for the cell. Controls the activities of the cell.
    • 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.
    • Rough Endoplasmic Reticulum A membrane system of flattened parallel cavities which are interconnected and covered with ribosomes. An intracellular transport system.
    • 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).
    • 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.
    • 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.
    • Photosynthesis - blue-green bacteria make their own food by photosynthesis.
    • Cell Division