Which of the following statements about microtubules is true?
(a) Motor proteins move in a directional fashion along microtubules by using the inherent structural polarity of a protofilament.
(b) The centromere nucleates the microtubules of the mitotic spindle.
(c) Because microtubules are subject to dynamic instability, they are used only for transient structures in a cell.
(d) ATP hydrolysis by a tubulin heterodimer is important for controlling the growth of a microtubule.
Answer:
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