Chromosomes, the Cell Cycle, and Cell Division Also see Sample Problems For lecture summary including pictures. What You Need to Know Questions on this section typically will require thinking, not merely memory.
Chromosomes have a particular structure.
We use one example, protein phosphorylation, to illustrate one method the cell uses to regulate processes. Outside factors also regulate the cell cycle. Consider changes to chromosome structure, nuclear membrane structure, cytoskeleton. Prior to nuclear division, chromosomal DNA gets repackaged so it is more compact and can be moved about by the cytoskeleton. The nuclear membrane disintegrates prior to formation of the full spindle apparatus.