1. Focus Lesson Don’t forget to turn in your Home Learning to the bin!
Grab your pencil box and focus lesson. Work on the Textbook definition column. You can also use your notes on page 6 to get most of this info.
Remember! You must know these words to be successful- Completing this column is your way of Learning these words!

2. Home Learning Water enters the plant cell through osmosis.
This occurs because the concentration of water is higher outside of the cell.
As water passes through the cell membrane it enters the cytoplasm.
From there it travels to the chloroplast.
In this organelle the water is used as a reactant for the process of photosynthesis.
It combines with light energy and carbon dioxide to make glucose and oxygen.
Home Learning
Let’s review what our response should have included….

3. Essential Question How and why do cells divide?
What do you need to know to answer this question?
Why do cells need to divide?
What are the stages of the cell cycle?
What happens during each?

4. Cell Growth and Division
How will we get there
Last Class
This Class
Reviewed Cell Membrane
Page 18: Starch Iodine Lab
Page 19: I.P.
Quiz 8: Cell Membrane
Complete Corrections/ Enrichment on Page 20
Home Learning: Trace Water
Cell Growth and Division
Page 22: Diagram
Page 23: Notes

5. Cell Growth and Division
Notes: Page 23

6. What are the three principles of cell theory?
All organisms are made of cells
Cells are the smallest unit of life
ALL CELLS COME FROM PREEXISTING CELLS

7. What is Cell Division?
Cell division: the process by which a cell divides into two daughter cells

8. Your very FIRST baby picture!
1. Growth
All organisms start out as a single cell that divides to become a larger organism.
Cells do not get bigger in order to make an organism get bigger; they divide.
Your very FIRST baby picture!

9. Example: Sea Urchin
Sea Urchin Embryo
Adult Sea Urchin:

10. Who thinks they’ve got what it takes to be the next Lebron?
Bigger is better, right?
I need to volunteers. We are going to examine WHY cells divide within organisms to make many small cells rather than be made of a few LARGE cells.
Who thinks they’ve got what it takes to be the next Lebron?

11. BIG CELLS = BIG PROBLEMS
Why are we made up of a bunch of tiny microscopic cells instead of five huge cells?
Well what do we know cells need to do??
Get nutrients
Get rid of waste
The DNA has to be able to communicate with all of the organelles.

12. 2. Reproduction
When cells divide, they form two new cells. This is the way that some organisms (unicellular) reproduce.
Example: E. Coli

13. Sexual vs. Asexual Reproduction
Production of offspring from one parent
Usually produces genetically identical offspring
Bacteria reproduce by binary fission
Hydras reproduce by budding.
Kalanchoe plants form plantlets

14. Sexual vs. Asexual Reproduction
Fusion of two separate parent cells
Parent cells: gametes
Genetically different from the parent- creates genetic diversity
Most plants and animals reproduce this way.

15. 3. Repair
Cells can divide in order to repair tissue or other parts of an organism that are broken.
Example: A starfish can regenerate (regrow) an arm.

16. Prokaryotic Cell Division
REMEMBER: Prokaryotes lack nuclei
DNA is found in the cytoplasm
Most contain a single, circular piece of DNA
chromosome

17. Prokaryotic Cell Cycle
Takes place very rapidly
Growth→ DNA Replication→ Division
Known as binary fission

18. Eukaryotic Cell Division
DNA is protected by the nucleus, and coiled into chromosomes
Takes longer than prokaryotic division, because nucleus is in the way.

19. The Cell Cycle
Interphase: cell’s life prior to division when the cell doubles mass and DNA
G1 gap
Cell grows, makes new Proteins
and organelles
S- Synthesis Phase
Duplicates DNA
G2 gap
Shortest interphase
Many organelles and proteins
required for division are made

20. The Cell Cycle Mitosis the active process of cell division
Four stages will happen:
Prophase
Metaphase
Anaphase
Telophase

21. PROGRESS REPORTS
While you work on Page 22 I will be calling students up to sign for progress reports.
These reports must be signed and returned by NEXT FRIDAY.
They include your CGA 1 grade.
I curved the test, which means 5 of your peers received a 100%.
If you did not score near 70% you are not on track to pass this class. It is important to reflect and change this NOW.

22. Diagram this Process: Page 22 Next to each summarize what the cell is doing.
Top
half
of page

23. Last Thing for Page 22: How fast does this happen?
Some cells divide more rapidly than others.
Use Fig 5.2 on Page 136 to answer the following
Which cells live the longest?
Which cells live the shortest?
Form a hypothesis to answer the following scientific question:
Why do some body cells live longer than others?

24. Begin creating flashcards for this vocabulary
Home Learning
Begin creating flashcards for this vocabulary
Check the organization of your notebook.
Update your Table of Contents
GET PROGRESS REPORT SIGNED