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

question 54

Multiple Choice

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.

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