Question

where are the motor proteins that move chromosomes toward the poles of the mitotic spindle located?
o along the length of kinetochore microtubules only
o on the kinetochores only
o at the centrosomes only
o on the kinetochores and at the centrosomes

Explanation:

Motor proteins that move chromosomes toward the poles of the mitotic spindle are located on the kinetochores. Kinetochores are protein - DNA complexes associated with the centromeres of chromosomes. Microtubules attach to kinetochores, and motor proteins on the kinetochores use ATP hydrolysis to generate force and move chromosomes. Centrosomes are involved in organizing microtubules but are not the location of these motor proteins. Microtubules themselves are the tracks along which movement occurs, but the motor proteins are on the kinetochores.

Answer:

on the kinetochores only