Prokaryotic cells reproduce by a process called a. mitosis. b. meiosis. c. binary fission. d. binary fusion. 2. In eukaryotic cells, DNA is copied during a phase of the cell cycle called a. M phase. b. S phase. c. G1 phase. d. G2 phase. 3. The cytoplasm of a eukaryotic cell divides by a process called a. mitosis. b. meiosis. c. replication. d. cytokinesis. 4. The fibers that extend from centrosome to centrosome during mitosis are a. polar fibers. b. spindle fibers. c. kinetochore fibers. d. binary fibers. 5. In the G0 phase, cells a. synthesize DNA. b. prepare for cell division. c. exit from the cell cycle. d. move their chromosomes to the cell equator.