Final answer:
The centrosome is the organelle associated with motor proteins that rely on microtubules during cytokinesis, serving as the microtubule-organizing center and organizing the mitotic spindle.
Step-by-step explanation:
The organelle that associates with motor proteins that rely on microtubules during cytokinesis is the centrosome. Motor proteins, such as dynein and kinesin, interact with microtubules, enabling various cellular movements, including the separation of chromosomes during cell division.
The centrosome serves as a microtubule-organizing center (MTOC), which is particularly active during cytokinesis, a process that divides the cell's cytoplasm into two daughter cells. In animal cells, the centrosome is composed of two centrioles positioned at right angles to each other and is found near the nucleus. It is responsible for organizing the mitotic spindle, which is crucial for the segregation of chromosomes during cell division. Hence, during cytokinesis, the centrosome and its associated motor proteins play a vital role in the successful completion of cell division.