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- In cells, actin filaments form bundles or networks. How do cells form such structures, and what specifically determines whether actin filaments will form a bundle or a network?Actin filaments have a defined polarity. What is filament polarity? How is it generated at the subunit level?Actin filaments are composed of?
- How is filament polarity detectable?If the graph represents one actin filament, and line A represents dynamic activity at the plus end and line B represents dynamic activity at the minus end, which of the following must be true? Group of answer choices Formin proteins have been removed. Treadmilling is occurring at 1000 mM. CapZ proteins are not present. Nucleation is occurring at 100 mM.How many actin monomers within an actin filament would a myosin molecule need to ratchet in order to contract a cell by approximately 1 μm?
- Why is it that intermediate filaments have iden-tical ends and lack polarity, whereas actin filaments andmicrotubules have two distinct ends with a defined polar-ity?The concentration of actin in cells is 50–100 timesgreater than the critical concentration observed for pureactin in a test tube. How is this possible? What prevents theactin subunits in cells from polymerizing into filaments?Why is it advantageous to the cell to maintain such a largepool of actin subunits?Under certain stable concentration conditions, actin monomers in their ATP form will polymerize to form filaments that disperse again into free actin monomers over time. Explain.
- What is the role of actin filaments?Would you expect to find motor proteins that move along intermediate filaments? Explain why or why not.What would be the consequence for actin filament assembly/disassembly if a mutation prevented actin’s ability to bind ATP? What would be the consequence if a mutation prevented actin’s ability to hydrolyze ATP?