Actin filaments and microtubules are similar with respect to each of the following EXCEP O inherent polarity with plus and minus ends growth requires an organizing center association with motor proteins both are polymers of subunits regular remodeling
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- Which of the following molecular motors is known to travel in an anterograde direction along microtubules? myosins kinesins myosins and dyneins dyneinsWhich of the following CORRECTLY describes a similarity when comparing actin filaments and microtubules? O Their motor proteins require ATP. O Their disassembly directly requires ATP. O Their assembly directly requires ATP. O Their assembly is faster at the plus end directly because of ATP.Addition of which of the following would increase the rate of actin depolymerization on the minus end of the filament by dissociating ADP-actin? Othymosin-b4 O cofilin O ATP-G-actin O profilin O Cap Z
- 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.Which of the following describes an F-actin microfilament? A flexible, helical filament composed of two strands assembled from G-actin 13 protofilaments composed of heterodimers with a hollow core a flexible filament composed of 13 interwoven protofilaments Eight tetramers twisted into a rope-like filamentWhat is not a similarity between motility of cilia/flagella and skeletal muscle? Group of answer choices: Both have cytoskeletal fibers arranged in a ring pattern Both involve motor proteins connected to a cytoskeleton "track" Both can produce movement Both require ATP hydrolysis
- Give two examples of biological functions that are enabled by microfilaments or microtubules together with associated motor proteins.These could be whole cell functions or functions within the cell.can microtubule replace actin filament?why or why not?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?
- Determine whether the following statements apply to microtubules, intermediate filaments, or actin filaments."a. Thinnest cytoskeletal filaments; are associated with the motor protein myosinb. Consist of proteins twisted together into a ropelike formc. Allow certain cells to “crawl” and change the shape and size of the celld. Consist of protein subunits surrounding a hollow coree. Help a cell to resist mechanical stressf. Grow from the cell’s centrosome"Which of the following are characteristics of both actin filaments and microtubules? Select all that apply They have structural polarity Their filaments undergo treadmilling Capping proteins affect length and stability of the filament The monomers bind ATP and spontaneously form polymersMatch the following Actin filaments Intermediate filaments Microtubules [Choose ] Most concentrated just under the cell membrane and help maintain the shape of cellular projections ✓ Support cell shape and fix organelles in place Act as track for organelles and other materials to move Most concentrated just u [Choose ]