“Multiply, Divide, & Survive” Questions, p. 102-105 “Multiply, Divide, & Survive”

1. Scientists know that most cells containing nucleu undergo a seris of steps, called ___ & ___ to divide into 2 cells. 2. Collectively these processes are referred to as __ __. 3. In the 19th century, scientists observed some rod-shaped structures in the nuclei of cells called ___.

4. What are chromosomes composed of? 5. Chromosomes occur in __. 6. How many chromosomes do humans have in their body cells? 7. Chromosomes are made of hereditary units called ___.

8. When cells are not dividing, they are in a stage called ___. 9. What happens to the chromosomes during this phase? 10. The new cells that will be created at the end of cell division of referred to as __ __. 11. What are the 4 “phases” of mitosis?

12. What are the 4 phases of mitosis? 13. During prophase, spindle fibers develop. What do these fibers do? 14. What happens to the nuclear envelope during this phase? 15. What do the chromosomes do during prophase?

16. What happens to the chromosomes during metaphase? 17. What happens to the chromosomes during anaphase? 18. What is the last phase of mitosis? 19. During this phase, how many nuclei are present?

20. When mitosis is over, the final step of cell division begins 20. When mitosis is over, the final step of cell division begins. What is it called? 21. What happens during this process? 22. What forms during cytokinesis in plant cells, but not in animal cells?