Question

in the \squeezed out nerve cell\ study system, mitochondria are no longer producing atp. vesicle movement continues for a while in the study preparation that is under the videomicroscope, but then stops. why? choose the single best answer. atp runs out so kinesin cant be phosphorylated and cant walk. microtubules disintegrate so kinesin has nothing to walk on. vesicles detach from kinesin so just float around or stay still.

Explanation:

Kinesin - a motor protein for vesicle movement - requires ATP for phosphorylation to "walk" along micro - tubules. When mitochondria stop producing ATP and the existing ATP is depleted, kinesin cannot be phosphorylated and vesicle movement stops. Micro - tubules are not mentioned to disintegrate and there is no indication that vesicles detach from kinesin.

Answer:

ATP runs out so kinesin can't be phosphorylated and can't walk.