試題詳解

37. About microtubules, which of the following descriptions are correct?
(A) Microtubules are associated with the microtubule-organizing center (MTOC) with their (-) ends, and the (+) ends of microtubules point away from the MTOC.
(B) Treadmill (progressive growth) of microtubules requires ATP, with GTP-bound ẞ-tubulins added at the (+) ends of microtubules.
(C) Kinesins are microtubule (-)-end-orineted motors, and dyneins are (+)-end-oriented motor proteins.
(D) Microtubules go through alternating rescue (growing phase) and catastrophe (shrinking phase), a process known as the dynamic instability.
(E) Microtubules determine the shape of a cell but do not function in regulating cellular polarity.