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Review the various types of cytoskeletal elements and their function by completing each sentence. cilia actin...
of the three types of fibers; microfilaments (or and intermediate filaments are fibers with diameters in a Microtubules are the filaments) are the middle range. Microtubules are hollow rods about 25 nm in diameter and 200 nm to 25 um in length. Microtubule fibers are constructed of the globular protein A tubulin dimer consists of two slightly different polypeptides: a-tubulin and B-tubulin. Microtubules shape and support the cell and serve as tracks to guide motor proteins carrving organelles to their...
2. Short response (3pts each, 2 sentences max) A. Please rank the three cytoskeletal elements we have discussed from most to least flexible, AND describe how the assembled structure of these elements contributes to this property. Most flexible - - Least flexible B. What molecular feature(s) gives microtubules and actin fibers polarity? Microtubules - Actin fibers - C. Actin-based movement often involves changes in cell shape while cilia-based movement generally doesn't. Why? D. Please describe a function of intermediate filaments,...
Which cytoskeletal element is being described? Answer with the letter corresponding to the element: M. Microtubules A. Actin filaments IF. Intermediate filaments 1. Formation requires nucleation at a centrosome 1 2. Forms the contractile ring during cytoplasmic division (cytokinesis) 2 3. Found organized in a characteristic 9+2 arrangement in cilia and flagella 3 4. Examples include keratin and neurofilaments, which are important in the mechanical strength of skin and axons 4 5. Involved cellular crawling such as seen with white...
LABORATORY REPORT QUESTIONS EXERCISE 3 Name Date Laboratory Section Score/Grade PART 1 - Multiple Choice - 1. The portion of the cell that forms part of the mitotic spindle during division is the (a) endoplasmic reticulum (b) Golgi complex (c) cytoplasm (d) pericentriolar area of the centrosome 2. Movement of molecules or ions from a region of higher concentration to a region of lower concentration via a process that does not require cellular energy is called (a) phagocytosis (b) diffusion...