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The Current Model for the Nucleation of Microtubules Is That γ\gamma

Question 54

Multiple Choice

The current model for the nucleation of microtubules is that a helical array of γ\gamma -tubulin subunits forms an open,lock-washer-like ring-shaped template upon which the first row of α\alphaβ\beta -tubulin dimers assembles.How does this model account for the polarity of microtubules?


A) Only the α\alpha -tubulin of a heterodimer can bind to the ring of γ\gamma -subunits.
B) Only the β\beta -tubulin of a heterodimer can bind to the ring of γ\gamma -subunits.
C) The ring structure straightens out the microtubule.
D) The ring structure interacts with a homodimer instead of a heterodimer.
E) Only the α\alpha -tubulin of a heterodimer can bind to the ring of γ\gamma -subunits and the ring structure straightens out the microtubule.

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