Whether a microtubule shrinks or grows is determined by
a. the rate of GTP-bound tubulin addition relative to the rate of tubulin GTP hydrolysis.
b. the phosphorylation state of ?-tubulin.
c. the rate of ATP hydrolysis relative to the rate of ATP-bound tubulin addition.
d. the presence or absence of ?-tubulin.
Ans: a. the rate of GTP-bound tubulin addition relative to the rate of tubulin GTP hydrolysis.
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