BIOLOGY UNIT 1

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  • Movement and Stability in cells
    • UNDULIPODIA AND CILIA
      • They are both structurally the same (They are hair like extensions that stick out from the surface of cells).
        • Each one is made up of a cylinder that contains nine microtubules arranged in a circle.
          • There are two microtubules in a central bundle.
            • They both can move because microtubules can use energy from ATP.
    • CILIA
      • In ciliated epithelial tissue, the sweeping movements of the cilia move substances such as mucus across the surface of the cells.
        • Short in size- less than 10 micrometers long.
    • UNDULIPODIA
      • Longer than cilia.
      • The undulipodium that forms the tail of a sperm cell can move the whole cell. The long, whip-like undulipodium on the protocist enables it to move.

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