BIOL 1001 Chapter : Chapter 9 Part 2 Of 3
Document Summary
Chapter 9 part 2 of 3 (begin material for exam 3) During interphase a cell _grows, _replicates its dna, and often _differentiates. Most eukaryotic cells spend the majority of their time in __interphase. Ex: human skin cells replicate about once a day, spend about 22 h in interphase. Interphase contains three phases - g1 =gap 1, s, g2 = gap 2. During _g1 phase the cell: almost always grows in size, often __differentiates. Decides whether or not to divide based on signals. If signals cause the cell to divide then the cell enters __s phase. Once the cell enters s phase it is __committed to dividing, there is no turning back! During s phase the cell ___replicates its dna fig. After s phase the cell enters _g2 phase: more growth. The cell cycle is carefully controlled: not enough cell division can be bad, damaged cells are not replaced, too much cell division can be bad, tumors can form.
