1. EOC Level2

3. Why do you think cells need to divide?
Cell Growth & Division
Why do you think cells need to divide?

4. Cells divide for three reasons…
1. Growth of organism
DNA cannot function in a large cell.
Materials cannot be transported through the cell fast enough.
2. Repair of tissues
3. Reproduction

5. Consequences of Large Cells
1. SA:V ratio gets smaller; things cannot get in and out of the cell quick enough.
2.Large animals do not have large cells.

6. Figure 4.2 Why Cells Are Small (Part 1)
l x w x 6
l x w x h

7. Cell Cycle Interphase (longest part of the cell cycle)
Interphase includes all the time that the cell is not dividing.
G1 (Growth 1)
S (Synthesis) - DNA copies
G2 (Growth 2) - cell prepares for division
Mitosis-nucleus divides
Cytokinesis-cell divides

8. Reading , Math & Science Egg Donation News Feature
Why We Should Exercise

9. Assignment- Exit Slip
Calculate the surface area to volume ratio for a cuboidal cell with 1.5cm, 2.5cm, 4cm, and 10cm.
Predict what problems a 10cm cell would have vs. a 1.5 cm cell would have.

10. Assignment- Exit Slip
Read 10.1 and 10.2 complete all section questions. p240
Calculate the surface area to volume ratio for a cuboidal cell with 1.5cm, 2.5cm, 4cm, and 10cm.
Predict what problems a 10cm cell would have vs. a 1.5 cm cell would have.
Rd. 253, answer the following:
Explain why scientists are interested in SC when your body can replicate its own cells.
Propose another alternative to SCR relating to cell division.
List two ways researchers can use stem cells to help people.

12. Anticipatory Set
___ Which of the following is a requirement for all active transport processes?
A. ADP
B. ATP
C. AFP
D. AQP

13. Analyze the diagram above, what process is taking place, and what type of cell transport process is this?
A. phagocytosis, passive transport
B. phagocytosis, active transport
C. receptor mediated endocytosis, passive
transport
D. exocytosis, active transport

14. Using the diagram, the process that will occur following the process shown in the diagram to expel any unneeded contents would most likely be? (B.1.g, DOK2)
A. endocytosis
B. pinocytosis
C. exocytosis
D. phagocytosis

15. Read and List 2 reasons the nucleus divides.
Mitosis is the process of nuclear division. The cell divides because the DNA would not be able to code for all the traits necessary of a large cell, and because substances can not enter and exit a cell fast enough
mitosis animation
mitosis song
How cancer works

16. Interphase The longest period of the cell cycle.
DNA duplicates during this phase.
Centrioles divide.
Centrioles are a type of cytoskeleton that is only visible when the cell is dividing. Otherwise they are incognito.

17. After interphase mitosis begins
What is dividing in mitosis?

18. Prophase Step 1 of mitosis Centrioles separate. Spindle fibers form.
Nucleus disappears.
Chromosomes tighten up and prepare to move.

19. Metaphase Step 2 of mitosis
Chromosomes line up in the center of the cell.
Chromosomes connect to spindle fibers at their centromere.

20. Anaphase Step 3 of mitosis
Chromosomes are pulled by the spindle fibers to opposite ends of the cell.

21. Telophase
Step 4 of mitosis
Chromosomes separate.
Two nuclei reform

22. Cytokinesis Following mitosis, cytokinesis occurs.
Cytoplasm pinches in half and two identical daughter cells result.
In plant cells a cell plate will form
Mitosis Greenday Song

25. Review of the Cell Cycle
1.Interphase
2. Prophase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis

26. Name that Phase

29. Metaphase Interphase Prophase Anaphase Telophase
List the 6 stages of the cell cycle, and circle the stages that include mitosis.
Anaphase
Telophase

30. Review of the Cell Cycle
1.Interphase
2. Prophase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis
Mitosis Animation I- Cells Alive
Mitosis Animation II-Higher Ed
Mitosis Animation III-Hybrid Medical

31. 11-27-11 1. What three reasons cause the cell to divide?
Calculate the change of concentration of hydrogen in a pH of 2 to a pH of 5.
Calculate SA:V ratio for a cube cell with a length of 5nm.
WRITE THESE QUESTIONS AND ANSWERS DOWN FOR A GRADE.

32. CREATE THIS BY END OF CLASS!
Use two colors of paper to complete the following:
Diagram and label the 6 stages of the cell cycle (one color for interphase and cytokinesis, one color for 4 stages of mitosis
Describe what is happening in each stage.
Use the yarn to make spindle fibers and colored paper to make chromosomes.
Must have 3 chromosomes per diagram.

33. Mitosis Math What is the longest phase of the cell cycle?
What % of the cell’s life does it comprise?
What is the shortest phase of the cell cycle?

37. Cancer The inability of cells to regulate cell division.
Cancer = uncontrolled cell division.
Tumors = result in masses of cells that have uncontrollably divided.
Many factors such as tobacco, radiation, and some viruses may lead to the breakdown of cell division regulation.

38. Cancer
Craniotomy

39. SOLVE the Problem
Amazing Pass

40. Calculate the following: Show equation
Below are given the length of a cell’s life. Calculate the amount of time it spends in Interphase and mitosis.
1. 9 days months
2. 4 hours minutes
3. 16 days months
4. 2 years years
5. 5 minutes days
6. 17 hours months
7. 40 months years
8. 18 days

44. Mitosis vs. Meiosis MEIOSIS MITOSIS Sex cell division
Start with a full set of chromosomes from mom and dad (diploid=2n), end with only half the starting number (haploid=n)
Sex cells can only have _______ a set of chromosomes because they will fuse and form ________. ½ + ½ = 1
Somatic cell division
Start with a full set of chromosomes from mom and dad (diploid=2n), end with a diploid.

45. Meiosis Animation-Cells Alive Meiosis Animation II

46. Exit Slip
Draw the process of meiosis as shown on page 276, and give a brief description of each phase.

47. Know its time to dance

48. Vocabulary List #7 Mitosis- somatic cell division
Meiosis- sex cell division
Anerobic- without oxygen
Aerobic- with oxygen
Ose- sugar
Ase- enzyme
DNA- deoxyribonucleic acid
Nucleotide- monomer of DNA
Double helix- twisted ladder, shape of DNA
Cancer- uncontrolled cell division