Final answer:
Spindle fibers, composed of microtubules and originating from the centrosome, are responsible for moving chromosomes into place and aligning them during mitosis. These include both kinetochore microtubules and polar microtubules.
Step-by-step explanation:
The components that move chromosomes to their correct places and align them during mitosis are the spindle fibers. These spindle fibers are primarily composed of microtubules, which are protein structures that help separate chromosomes during cell division. The mitotic spindles, which are essential for this process, arise from the centrosome. As mitosis progresses, the spindle fibers fully attach to the centromere of each chromosome or sister chromatids. There are two kinds of microtubules in spindle fibers: kinetochore microtubules, which attach directly to the kinetochore found at the centromere of the chromosomes, and polar microtubules, which interact with those from the opposite pole of the cell to assist in separating the chromatids.