Administration of a drug that inhibits the action of motor proteins moving towards the plus ends of their respective cytoskeletal elements would affect which of the following? 1) movement of a pair of sister chromatids back and forth across the cell, resting at the metaphase plate 2) division of the cytoplasm into two daughter cells 3) movement of polar microtubules, serving to distance spindle poles further from each other

All of the answers are correct

Explanation:

Motor proteins that use microtubules as substrate are called microtubule motors. They move along microtubules through interaction with tubulin. Examples of such motor proteins are dynein and kinesin. There are two basic types of microtubule motors: plus-end motors and minus-end motors. They differ in direction in which they move along the microtubule.

Kinesins move towards the positive end of a microtubule and they are involved in cell division.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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