Question 33 2. 5 Points All of the following statements about cytoskeletal filaments and motor proteins are true except for one. Which statement is false? A actin filaments are polar and associate with motor proteins B intermediate filaments are polar and associate with motor proteins C cytoskeletal motor proteins use nucleotide hydrolysis to power movement D intermediate filaments are non-polar and do not associate with motor proteins E microtubules are polar and associate with motor proteins
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Which of the following is FALSE? Choose one: A. Cytoplasmic intermediate filaments generally do NOT associate and dissociate rapidly, whereas nuclear lamins can during mitosis. B. Myosins can attach to and move along both intermediate filaments or actin filaments. C. Actin and tubulin must bind different nucleotide triphosphates in order to polymerize into filaments, whereas intermediate filament proteins do not bind nucleotide triphosphates. D. Intermediate filaments are present in both the cytoplasm (e.g., keratins) and nucleus (e.g., nuclear lamins). E. Microtubules in cilia and flagella are in a 9+2 arrangement with dyneins between the microtubule doublets.
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Vesicles, organelles, and chromosomes are all moved along cytoskeletal elements/proteins. What, below, is FALSE about these processes? Select one: a. Dynein, part of the kinetochore structure (what is this again?), moves towards the - pole of microtubules during metaphase. b. Myosin, the motor protein that works on actin microfilaments, requires ATP to move. This is how certain cells, like amoeba, move their plasma membranes/themselves through the environment. c. Kinesin moves towards the + end of microtubules; and, like almost all myosins and dyneins, requires ATP (a nucleotide) to power kinesin's movement. d. Both actin and tubulin bind to ATP and GTP, respectively. It is through the hydrolysis of these nucleotides, to their diphosphate form (like ADP/GDP), that microfilaments and microtubules can depolymerize more rapidly. e. All of the above are TRUE
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