The Critical Concentration for Tubulin Polymerization Is the Concentration of

Multiple Choice

The critical concentration for tubulin polymerization is the concentration of

A) tubulin dimers at which all dimers assemble into microtubules.
B) unassembled tubulin dimers when assembly is balanced with disassembly.
C) tubulin dimers at which dimers assemble onto microtubule minus ends but disassemble from plus ends.
D) unassembled tubulin dimers when there is net disassembly of dimers from both microtubule ends.
E) tubulin dimers in most cells.