230_020411 (1)

230_020411 (1) - Special announcement Today is the last day...

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Unformatted text preview: Special announcement Today is the last day to drop without receiving a “W” The Cytoskeleton • Cytoskeletal elements • Extracellular matrix • Intracellular junctions Microtubules Microfilaments Intermediate filaments Cytoskeleton: What is it? • Network of fibers extending throughout the cell • Organizes structures and activities within the cell • Three types: microtubules, microfilaments, and intermediate filaments • Provides structural support • Highly dynamic • Controls cell motility via motor proteins Microtubules micro.magnet.fsu.edu/.../microtubules.html • Consists of tubulin monomers: alpha and beta-tubulin • Diameter: 25nm • Functions: cell shape, motility, chromosome movements during cell division, organelle movement • Two end: plus=highest dynamic rate and minus=lower rate + end- end Motor Proteins Motor proteins: Kinesin moves towards the + end Dynein moves towards the - end ATP Microtubules: Centrosomes • “microtubule organizing center” • Microtubules grow from centrosomes • Contain a pair of centrioles, 9 sets of triplet microtubules arranged in a ring (9 +3) • Found in animal cells, but not in plant and yeast cells. Flagella Cilia Microtubules: Locomotion • Used for cell propulsion • Used to move fluid over the cell and prolusion • Present in large numbers Microtubules: Cilia arranged in a ring (9 +3) arranged in a ring (9 +2) Microfilaments: Actin Filaments academic.brooklyn.cuny.edu/.../page/actin.html • Composed of actin monomers • Most abundant protein in eukaryotes • Highly conserved • Important for motility, cell...
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This note was uploaded on 11/28/2011 for the course BIOL 230 taught by Professor J.breckler during the Spring '11 term at S.F. State.

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230_020411 (1) - Special announcement Today is the last day...

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