lecture.05

lecture.05 - Eukaryotes: Cytoskeleton - a network of fibers...

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Eukaryotes: Cytoskeleton - a network of fibers that organizes structures and activities in the cell - extends throughout the cytoplasm - helps to support the cell and maintain its shape - anchores many organelles - interacts with motor proteins to produce motility - recent evidence suggests that the cytoskeleton may help regulate biochemical activities - it is composed of three types of molecular structures: - microtubules - microfilaments - intermediate filaments
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Eukaryotes: Microtubules - the thickest of the three components of the cytoskeleton - hollow rods about 25 nm in diameter, made of tubulin - shapes the cell, provides compression resistance - guide- movement of organelles - vesicles travel along “monorails” provided by the cytoskeleton - separates chromosomes during cell division
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Eukaryotes: Microtubules - microtubules give cilia and flagella structure and to- gether with motor proteins provides motion - cilia and flagella differ in their beating patterns - cilia and flagella share a common ultrastructure: - a core of micro- tubules sheathed by the plasma membrane - a basal body that anchors the cilium or flagellum - a motor protein called dynein , drives the bending movements of a cilium or flagellum
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Eukaryotes: Microfilaments - also called actin filaments, are the thinnest components - are solid rods about 7 nm in diameter, built as a twisted double chain of actin subunits - bear tension, resisting pulling forces within the cell - form a 3D network just inside the plasma membrane to help support the cell’s shape - bundles of microfilaments make up the core of micro- villi of intestinal cells
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lecture.05 - Eukaryotes: Cytoskeleton - a network of fibers...

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