Question

where do the microtubules of the spindle originate during mitosis in animal cells?
kinetochore
centrosome
chromatid
centromere
centriole

Explanation:

In animal cells, during mitosis, the microtubules of the spindle originate from the centrosome. The centrosome is an organelle that serves as the main microtubule - organizing center of the cell. Centrioles are part of the centrosome (in animal cells), but the entire structure (centrosome) is the origin. The centromere is the region of a chromosome where the two sister chromatids are held together. A chromatid is one of the two identical halves of a replicated chromosome. The kinetochore is a protein structure on the centromere that attaches to the spindle microtubules.

Answer:

centrosome