試題詳解

60. In nerves, vesicles can move the length of an axon at a rate that far exceeds that which would be predicted for simple diffusion. Which of the following models best explains vesicular movement in these cells?
(A) Depolymerization of actin microfilaments attached to vesicles pulls the vesicles toward the site of depolymerization.
(B) Vesicles are propelled by fluid movement generated by changes in osmotic potential within the cells.
(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 the cell.
(E) Vesicles are attached to the protein kinesin, which slides along microtubules by an ATP dependent process.