1. Limits to Cell Growth
There are two main reasons why cells divide rather than continuing to grow indefinitely.        
The larger a cell becomes, the more demands the cell places on its DNA. In addition, the cell has more trouble moving enough nutrients and wastes across the cell membrane. 1 1 1

2. Think of the Kitchen in your House as the cell’s nucleus.
Would your kitchen be able to do it’s job if your family size doubled?
Why or why not?
Would your kitchen work for this school?
Could it produce enough food?
How would you get all the supplies (food) into your kitchen?
Where would all the waste go? Do you have enough trash cans?

3. 1
A large cell that has trouble exchanging materials is like a small town with a 
A.fire department that does not have enough trucks.
B.main street that is too narrow.
C.library that does not have enough books.

4. 2
The process by which a cell divides into two new daughter cells is called 
A.cell growth.
B.cell division.
C.DNA replication.

5. Asexual reproduction leads to two cells with the exact same DNA
Asexual reproduction leads to two cells with the exact same DNA. All of your cells came from on cell originally.
If all your cells have the same DNA, then why are your cells different? Your skin cells are different than your heart cells and different than your blood cells.

6. Three reasons why cells reproduce by asexual reproduction: 1. Growth 2
Three reasons why cells reproduce by asexual reproduction: Growth Repair Replacement
Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.
Cell that reproduce by asexual reproduction reproduce constantly.

8. Mitosis Interphase (G1, S, G2) Prophase Metaphase Anaphase
Cell division occurs in a series of stages, or phases.
Interphase (G1, S, G2)
Prophase
Metaphase
Anaphase
Telophase & Cytokinesis

9. 3 Which of the following phases is the first step in mitosis? Prophase
Telophase
Metaphase
Anaphase

10. Interphase occurs before mitosis begins
Chromosomes are copied (# doubles)
Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase
CELL MEMBRANE
Nucleus
Cytoplasm

11. Interphase Plant Cell Animal Cell
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12. Prophase 1st step in Mitosis
Mitosis begins (cell begins to divide)
Centrioles (or poles) appear and begin to move to opposite end of the cell.
Spindle fibers form between the poles.
Centrioles
Sister chromatids
Spindle fibers

13. Prophase Plant Cell Animal Cell Spindle fibers Centrioles
Photographs from:

14. Metaphase 2nd step in Mitosis
Chromatids (or pairs of chromosomes) attach to the spindle fibers.
Centrioles
Spindle fibers

15. Metaphase Plant Cell Animal Cell
Photographs from:

16. Anaphase 3rd step in Mitosis
Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell.
Centrioles
Spindle fibers

17. Anaphase Plant Cell Animal Cell
Photographs from:

18. Telophase 4th step in Mitosis
Two new nuclei form.
Chromosomes appear as chromatin (threads rather than rods).
Mitosis ends.
Nuclei
Nuclei
Chromatin

19. Telophase Plant Cell Animal Cell
Photographs from:

20. Cytokinesis occurs after mitosis
Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

21. 4 The process of DNA replication is necessary before a cell —
codes for RNA molecules
modifies lysosome enzymes
divides into two cells
makes a protein

22. Animal Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             

23. Plant Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             

24. 5 What is the correct sequence for plant cell mitosis? A, B, D, C
C, B, A, D
B, A, D, C
D, C, B, A

25. 6
Which phase of mitosis would be seen next?
A B C D

26. Cell Cycle

27. - Cell Division
The Cell Cycle 28

28. The Cell Cycle 29 29

29. Mitosis Animation