60. In nerves, vesicles can move the length of an axon at a rate that far exceeds that which would bepredicted for simple diffusion. Which of the following models best explains vesicular movement inthese cells?
(A) Depolymerization of actin microfilaments attached to vesicles pulls the vesicles toward the site ofdepolymerization.
(B) Vesicles are propelled by fluid movement generated by changes in osmotic potential within thecells.
(C) Vesicles are moved by alternate contraction and relaxation of actin-myosin "muscle" complexes.
(D) Vesicles, by virtue of their net negative charge, are attracted to positively charged regions of thecell.
(E) Vesicles are attached to the protein kinesin, which slides along microtubules by an ATPdependent process.