Chapter 17 Answers - Study Guide Chapter 17 Cytoskeleton...

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Study Guide Chapter 17 Cytoskeleton Answers 1. A—microtubules; B—intermediate filaments; C—actin filaments (microfilaments). 2. C, D, A, B, E 3. 4. Disagree. The plus ends of microtubules usually point toward the cell periphery while the minus ends point toward the cell center. This is because the ! -tubulin in the centrosome serves to nucleate microtubule growth. Since the centrosomes are near the center of the cell, the minus ends of microtubules are located there. Therefore, a minus-end directed microtubule motor would direct its cargo toward the center of the cell while a plus-end directed microtubule motor would direct its cargo toward the cell periphery. 5. The melanosomes are transported in the cell on microtubules. When it is advantageous for the animal to become lighter, a signal is sent to the pigment cell that causes the melanosomes to associate with dynein. Since dynein is a minus-end directed motor, it will transport the melanosomes toward the center of the cell, causing the melanosomes to aggregate in the center and the cell to take on a lighter appearance. When the animal wants to become darker, a signal is sent to the
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