複選題33. Which of the following statements about microtubules is (are) CORRECT? (A) Microtubules are an important target of several anti-cancer drugs, such as taxol and vincristine (B) Growth of microtubule dynamics occurs at the plus end, where as disassembly or catastrophe occurs at the minus end (C) Kinesins and dynein are responsible cargo transport towards the plus and the minus ends of microtubules, respectively (D) Centrosomes are microtubules organizing center (MTOC) that emit microtubule polymers with minus end towards the cell membrane and plus end towards the MTOC (E) The three tubulins, α, β, and y tubulins, are incorporated into regular microtubule polymers that are present throughout the entire cell