BCH1048 Tutorial 5 - The Cytoskeleton and Related...

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The Cytoskeleton and The Cytoskeleton and Related Structures Related Structures
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The cell The cell s internal skeleton helps s internal skeleton helps organize its structure and activities organize its structure and activities Eukaryotic cells contain a meshwork of protein fibers protein fibers , collectively called the cytoskeleton cytoskeleton , extending throughout the cytoplasm of a cell. These fibers: –p rov ide structural support structural support (a skeleton) and are involved in various types of cell movement cell movement ; and regulate cellular activities regulate cellular activities by mechanically transmitting signals transmitting signals from the cell’s surface to its
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THREE main kinds of fibers make up the THREE main kinds of fibers make up the cytoskeleton cytoskeleton
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Microfilament Microfilament Also called actin actin filaments filaments , are solid rods composed mainly of globular globular ( 球状的 ) proteins called actin actin , arranged in a twisted double chain. Form a 3-D network D network that helps support the cell’s shape. Often interact with other kinds of protein filaments to make cells contract contract . E.g. Contraction of muscle cells & movement of Amoeba & WBCs.
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Intermediate filament Intermediate filament Made of fibrous fibrous proteins rather than globular ones and have a ropelike structure. Serve mainly for
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BCH1048 Tutorial 5 - The Cytoskeleton and Related...

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