The centrosome and centrioles are crucial for the process of cell division in animal cells. during cell division, two centrioles come together with some other special proteins and form the centrosome. as mitosis progresses and chromosomes line up at the equator of the cell, the centrosomes are responsible for what occurrence in the dividing cell? a) they the cell's nucleus replicate dna. b) they are responsible for pinching the single nucleus into two at the end of mitosis. c) they are responsible for the production of the proteins that reform the nuclear membrane. eliminate d) they produce microtubules that attach themselves to the chromosomes and aid in separating them.