Which of the following statements about the cytoskeleton is incorrect? a. the dynamic aspect of cytoskeletal function is made possible by the assembly and disassembly of a few simple types of proteins into large aggregates. b. microfilaments are structurally rigid and resist compression, while microtubules resist tension (stretching). c. movement of cilia and flagella is the result of motor proteins causing microtubules to move relative to each other d. transport vesicles among the membranes of the endomembrane system depend on the function of the cytoskeleton.