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THREE TYPES OF FIBERS

THREE TYPES OF FIBERS - I MICROTUBULES-made up of tubulin...

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I. MICROTUBULES -made up of tubulin monomers -thickest & largest polymer -shape cell & guide movement of organelles -help separate chromosome copies in dividing cells -grow out of a centrosome: region near nucleus considered “microtubule-organizing center” a) CILIA/FLAGELLA Specialized arrangement: core of microtubles sheathed in plasma membrane – 9 doublets of microtubles in a ring, in center are 2 single microtubles “9+2” ONLY IN EUKARYOTES! Prokaryotes have helical filaments that rotate like screws Flagella: (long/big, 1or 2) Motion – snake-like, undulates, forward motion Cilia: (short, lots of them) Motion – back and forth motion “oar-like”, power strokes and return stroke, beat together II. MICROFILAMENTS -actin filaments -finest -involved in cell division/cell pinching -in all eukaryotes -twisted double chain of actin subunits -forms structural networks: links/branches -structural role: bear tension(pulling forces) -contain protein: Myosin, Actin -myosin act as motor protein by
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