Cytoskeleton – Flashcards
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A network of protein fibers that supports the shape of the cell and anchors organelles to fixed locations
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Cytoskeleton
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3 types of fibers compose the cytoskeleton
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actin filaments (microfilaments), microtubules, and intermediate filaments
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long fibers about 7 nm in diameter
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Actin filaments
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Each "pearl" or subunit on the chain
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actin
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Composed of a and b tubulin protein subunits arranged side by side to form a tube, stiff cytoskeleton elements that perform intracellular transport and the seperation of chromosomes during mitosis
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microtubules
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Composed of overlapping staggered tetramers of protein.
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Intermediate filaments
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The largest of the cytoskeletal elements, are hollow tubes about 25 nm in diameter, each composed of a ring of 13 protein protofilaments
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Microtubules
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Barrel shaped organelles found in the cells of animals and most protists
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Centrioles
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The region surrounding the pair of centrioles in almost all animal cells
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Centrosome
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Surrounds the centrioles in the centrosome
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pericentrolar material
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Four components required to move material along microtubules
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A vesicle or organelle that is to be transported, a motor protein that provides energy-driven motion, a connector molecule that connects the vesicle to the motor molecule, microtubules on which the vesicle will ride like a train on a rail
