How does the addition the rescue of a MT, paradoxically also cause it to be more

Question

How does the addition the rescue of a MT, paradoxically also cause it to be more susceptible to undergo another catastrophe?

A. Newly added -tubulin promotes exchange of GDP for GTP on adjacent & pre-existing -tubulin. B. Newly added -tubulin promotes exchange of GDP for GTP on adjacent & pre-existing -tubulin. C. Newly added tubulin has a GDP cap. D. Newly added -tubulin subunit activates GTP hydrolysis on adjacent & pre-existing -tubulin. E. Newly added -tubulin activates GTP hydrolysis on adjacent & pre-existing -tubulin.

Explanation / Answer

option D Newly added beta tubulin subunit activates GTP hydrolysis on adjacent and preexisting Beta tubulin .

this addition rescue the microtubule ,paradoxically also cause it to be more susceptible to undergo another catastrophe .

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