Which Phase of Microtubule Polymerization in Vitro Would Be Affected

Multiple Choice

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