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

Question

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

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

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