Multiple Choice
The current model for the nucleation of microtubules is that a helical array of -tubulin subunits forms an open,lock-washer-like ring-shaped template upon which the first row of -tubulin dimers assembles.How does this model account for the polarity of microtubules?
A) Only the -tubulin of a heterodimer can bind to the ring of -subunits.
B) Only the -tubulin of a heterodimer can bind to the ring of -subunits.
C) The ring structure straightens out the microtubule.
D) The ring structure interacts with a homodimer instead of a heterodimer.
E) Only the -tubulin of a heterodimer can bind to the ring of -subunits and the ring structure straightens out the microtubule.
Correct Answer:

Verified
Correct Answer:
Verified
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