Chapter 6(2) - Chapter 6 A Tour of the Cell 6.6-6.7...

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Chapter 6 A Tour of the Cell 6.6-6.7
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Cytoskeleton Network of fibers microtubules microfilaments intermediate filaments
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Function of the Cytoskeleton Support Maintain shape Animal cells lack a cell wall Motility Changes in cell location Movement of parts of the cell Involve Motor proteins Regulation
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Components of the Cytoskeleton Microtubules - 25 nm diameter hollow Subunits are Tubulin dimers Microfilaments – 7 nm diameter 2 actin strands Intermediate filaments – 8-12 nm diameter keratin type proteins
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Components of the Cytoskeleton Microfilaments two intertwined strands of actin 7nm diameter actin subunits Functions maintenance of cell shape Changes in cell shape Muscle contraction cytoplasmic streaming cell motility (pseudopodia) Cell division – cleavage furrow
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Centrosomes and Centrioles Animal Cells centrosome– near the nucleus; microtubule organizing center contains a pair of centrioles at right angles to one another
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Cilia and Flagella Specialized arrangement of microtubules motility Flagella – few in number, longer 9+2 Cilia – many per cell, shorter 9+2 or 9+0 – ONE per cell; “antennae” transmit signals from the environment to the interior
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Fig. 6-23 5 µm Direction of swimming (a) Motion of flagella Direction of organism’s movement Power stroke Recovery stroke (b) Motion of cilia 15 µm
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Fig. 6-24 0.1 µm Triplet (c) Cross section of basal body (a) Longitudinal section of cilium 0.5 µm Plasma membrane Basal body Microtubules (b) Cross section of cilium Plasma membrane Outer microtubule doublet Dynein proteins Central microtubule Radial spoke Protein cross- linking outer doublets 0.1 µm
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Cilia and Flagella Cilia and flagella share a common ultrastructure: A core of microtubules sheathed by the plasma membrane A basal body that anchors the cilium or flagellum A motor protein called dynein, which drives the bending movements of a cilium or flagellum
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Fig. 6-24
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