Fill in the Blanks Notes Quiz: Cell CycleOnline version review of notes provided in class on the cell cycle by Phoebe Schroeder 1 1 . Cells spend MOST of their time in ( cell cycle stage ) . 2 . Division of the nucleus is called . 3 . Division of the cytoplasm and entire cell is called . 4 . Chromosomes first become visible in . 5 . Sister chromatids are pulled apart in . 6 . Spindle fibers first appear in . 7 . Chromosomes line up on the equator of a cell in . 8 . The nuclear membrane reappears in . 9 . Spindle fibers attach to chromosomes in . 10 . Chromosomes unwind and go back to being chromatin in .