L23 - Becker et al The World of the Cell Figure 17-16...

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Becker et al., The World of the Cell Microtubules Are Nucleated at the Centrosome
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Figure 17-8a,b Essential Cell Biology (© Garland Science 2010) The Centrosome Duplicates To Form the Mitotic Spindle Poles
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Figure 17-9 Essential Cell Biology (© Garland Science 2010) Tubulin Dimers Are the Building Blocks of Microtubules
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Microtubules are not in equilibrium with free tubulin dimers. Instead, microtubules constantly grow and shrink. How do cells achieve this behavior? A) Cells are exempt from the laws of thermodynamics. B) One microtubule grows as another shrinks. C) Tubulin is degraded and replaced at a high rate. D) Energy is constantly supplied to the system.
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Figure 17-12 Essential Cell Biology (© Garland Science 2010) GTP Hydrolysis Controls Microtubule Dynamics
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Cilia Are Membrane Projections That Contain Microtubules
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Unformatted text preview: Becker et al., The World of the Cell Figure 17-16 Essential Cell Biology (© Garland Science 2010) Motor Proteins Walk Along Microtubules Ron Vale Laboratory Molecular Animation of Kinesin Motility Figure 14-3 Essential Cell Biology (© Garland Science 2010) Organelles Are Positioned for Maximal Efficiency Figure 17-29 Essential Cell Biology (© Garland Science 2010) Actin Polymerizes To Form Microfilaments Functional Comparison of Microtubules vs. Microfilaments Microtubules: • Cell shape and stability (cilia and flagella) • Organelle movement (kinesin and dynein) • Chromosome movements during mitosis Microfilaments: • Cell shape and stability (microvilli) • Organelle movement (myosin) • Stress transmission between cells...
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