Which one of the following statements about the cytoskeleton is correct?
a. The width of a cytoskeletal element is directly proportional to its length.
b. Intermediate filaments are wider than microtubules.
c. A cell can adjust the lengths of most of its cytoskeletal elements as needed.
d. Cytoskeletal elements have a common diameter, but differ in type by their lengths.
e. Actin filaments are always longer than microtubules.
