BIOLOGY 151 Lecture 4: Cell Division
Document Summary
G0, g1, s phase, g2, m phase. The actual division is a small part of the cycle. Interphase consists of g1, s, and g2. Cell growth, transcribe proteins for cell division. After this checkpoint, the cell irreversibly commits to cell division. Damage to dna, nutrients, and external signals are all assessed. Can either move into s phase or g0. Has the same amount of dna as before. Checks that all chromosomes have been replicated and that replicated. The cell either enters mitosis or the cycle halts to fix any problems. Checks if all the chromosomes are attached to the mitotic spindle. Is made when the growth factor is received. Naturally are inactive and do not do anything on their own. Turned on in the presence of cyclin. They"re enzymes that, when active, attach phosphate groups to other proteins. Inhibits the cell cycle until the cell is ready to divide.
