Name ______Date ______HOUR______
Section 2-3: The Cell Cycle (p. 42)
1. Why is it important for your body to produce millions of new cells by the time you finish reading this sentence?
The Life of a Cell (p. 42)
2. The life cycle of a cell, known as the , begins when the cell is and ends when the cell and forms new cells.
3. How does each new cell get its information for survival?
Mark each of the following statements True or False.
4.Bacteria have a single membrane-covered organelle.
5.Prokaryotic cells divide by binary fission.
6.Eukaryotic cells have more DNA than prokaryotic cells.
7. The chromosomes of eukaryotic cells contain only DNA.
8. A potato cell has more chromosomes than a human cell. True or False? (Circle one.)
9. Look at the chromosomes in Figure 12. Each of your body cells contains
a. 23 chromosomes.b. 46 pairs of homologous chromosomes.
c. 23 pairs of homologous chromosomes.d. 48 chromosomes.
10. What do pairs of homologous chromosomes have in common?
11. In the beginning of the eukaryotic cell cycle, the cell grows and duplicates its
and .
12. Where are chromatids held together?
13. Mitosis is all of the following EXCEPT
a. the process of chromosome separation.
b. the second stage of the eukaryotic cell cycle.
c. the process during which the cell divides.
d. the process by which each new cell gets a copy of each chromosome.
14. The cell in the third stage of the eukaryotic cell cycle.
15. How are the two new cells produced by mitosis related to the original cell?
Mitosis and the Cell Cycle (p. 44)
16. Before mitosis begins, what two types of paired cell structures are copied?
Use the diagrams on pages 44 and 45 to answer questions 17–20. Put the phases of mitosis in order by labeling them as Phase 1, Phase 2, Phase 3, or Phase 4.
17. The fibers attached to the centrioles pull the chromatids to opposite sides of the cell.
18. The chromosomes line up along the equator of the cell.
19. The nuclear membrane forms around the two sets of chromosomes, and the chromosomes unwind.
The fibers disappear.
20. The two pairs of centrioles move to opposite sides of the cell, and fibers form between them. The
fibers attach to the centromeres.
21. Describe how animal cells and eukaryotes without cell walls divide their cytoplasm.
Place the following structures in the order in which they form in eukaryotic cells with cell walls during cytokinesis. Write the appropriate number in the space provided.
22. cell wall
23. cell plate
24. cell membrane
SECTION 2-3 Vocabulary
In your own words, write a definition for each of the following terms in the space provided.
1. cell cycle
2. chromosome
3. binary fission
4. homologous chromosomes
5. chromatids
6. centromere
7. mitosis
8. cytokinesis
HOW DO ANIMAL AND PLANT MITOSIS DIFFER?