Which phase of microtubule polymerization in vitro would be affected most by adding short microtubules to unpolymerized GTP-tubulin?
A) lag phase
B) elongation phase
C) addition of tubulin dimers to microtubule (+) ends at the plateau phase
D) addition of tubulin dimers to microtubule (?) ends at the plateau phase
E) treadmilling
Answer: A
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