. "\"A process that is carried out at the cellular level that results in the assembly, arrangement of constituent parts, or disassembly of chromosomes, structures composed of a very long molecule of DNA and associated proteins that carries hereditary information.\" [GOC:ai, GOC:dph, GOC:jl, GOC:mah]" . . "chromosome organization" . "chromosome organisation" . . "chromosome organization and biogenesis" . "maintenance of genome integrity" . "nuclear genome maintenance" .