all of the following statements are true except: question 31 options: a) the mitotic spindles in prokaryotic cells are composed of microtubules. b) mitosis may occur without cytokinesis. c) mitosis and cytokinesis are required for asexual reproduction. d) all cells come from a preexisting cell. e) mitosis produces new nuclei with exactly the same chromosomal endowment as the parent nucleus.