The eukaryotic cytoskeleton is a highly dynamic network of filaments and motor proteins. Which of the following correctly describe activities of these cytoskeletal components? Select all that apply. Myosin motors walk toward the plus ends of intermediate filaments. Microfilaments help animal cells to divide into two daughter cells. Actin filaments resist compression to maintain cell shape. Microtubules provide tracks for vesicle transport.
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For each of the following, decide whether it applies to actin filaments, intermediate filaments, and/or microtubules. NOTE: there may be multiple answers for each statement. A. Found in the nucleus and cytoplasm B. Involved in the transport of vesicles and organelles C. Associate with proteins that help adhere cells to the extracellular matrix D. Their stability is influenced by nucleotide hydrolysis E. Directly involved in phagocytosis F. Can associate into bundles with the help of other proteins.
Sri K.
1. Does not form by polymerization of a particular subunit: 2. Found in cilia and flagella: 3. Important for maintaining cell shape: 4. Found only in mitochondria: 5. Made of actin subunits: 6. Made of tubulin subunits: 7. Is tissue-specific: 8. Forms spindle fibers in mitosis: 9. Important in muscle contraction: 10. Is made of carbohydrates: 11. Associates with kinesin and dynein motor proteins: 12. Associates with Myosin motor proteins:
Syed A.
Which of these is not true? a. Actin filaments are located under the plasma membrane. b. Microtubules are organized by centrosomes. c. Intermediate filaments are associated with the nuclear envelope. d. Motor molecules move materials along intermediate filaments
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