Which of the following correctly explains why the

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3. Which of the following correctly explains why the minus end of either actin filaments or microtubules depolymerizes more easily than the plus end? (A) The Critical Concentration for ATP-bound actin (or GTP-bound tubulin) is higher than the critical concentration of ADP-bound actin (or GDP-bound tubulin). (B) There is a higher concentration of free (unpolymerized) actin or tubulin near the plus end than at the minus end. (C) The plus end is comprised almost entirely of ADP-bound actin (or GDP-bound tubulin), while the minus end is comprised almost entirely of ATP-bound actin (or GTP-bound tubulin). (D) For microtubules, there are specific GEF proteins that act on the tubulin components near the minus end, which causes these filaments to become re-loaded with GTP and thus depolymerize. (E) The Critical Concentration for ATP-bound actin (or GTP-bound tubulin) is less than the critical concentration of ADP-bound actin (or GDP-bound tubulin).
4. For cytoskeletal filaments, the term treadmilling describes:
5. The cytoskeleton has to undergo dynamic changes in order to contribute to which of the following:

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