1400 nm 700 nm 300 nm fiber (looped domains)
30 nm chromatin fiber
Scaffolding Condensed chromatin protein Extended chromatin
DNA wound around a cluster of histone molecules
Histone 10 nm
DNA double helix
docsity.com Fig. 10-4, p. 216
The Cell Cycle
• When cells reach a certain size, they usually either stop growing or divide • cell cycle • Stages through which a cell passes from one cell division to the next • Timing varies (usually 8 to 20 hours in actively growing plant and animal cells) • Consists of two main phases, interphase and M phase
docsity.com p. 234
Nuclear envelope Plasma membrane
Fig.docsity.com 10-6a, p. 218
(a) Cell carries out normal life activities. Chromosomes become duplicated.
Sister Chromatids and Centromeres
Kinetochore Sister chr..