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311C_chapter 6 p3 - Detox of active oxygen species by...

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Detox of active oxygen species by catalase happens in which of the following? Peroxisomes.
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Cytoskeleton and extracellular components Chapter 6
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Topics covered Components of cytoskeleton Extracellular components
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The cytoskeleton Is a network of fibers extending throughout the cytoplasm Figure 6.20 Microtubule 0.25 µm Microfilaments
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Roles of the Cytoskeleton Mechanical support to cells Movement with in cells, movement of cells Regulation of biochemical activities in cell
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Cytoskeleton A dynamic structural and functional framework Three types of filaments: A. Intermediate B. Microtubules C. Microfilaments
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7 nm 8 – 12 nm Diameter: 25 nm
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ble 6.1
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Microfilaments (actin)
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Actin cross-linking proteins bridge actin filaments to form bundles and networks Figure 18-5 Bundles Network
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Microfilaments that function in cellular motility Contain the protein myosin in addition to actin Motor protein in muscle contraction is myosin Actin filament Myosin filament Myosin motors in muscle cell contraction. (a) Muscle cell Myosin arm Figure 6.27 A
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http://www.sciencemag.org/feature/data/1049155s1.mov
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Amoeboid movement localized contraction of actin and myosin filaments Cortex (outer cytoplasm): gel with actin network Inner cytoplasm: sol with actin subunits Extending pseudopodium (b) Amoeboid movement Figure 6.27 B
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