1. The Cell Cycle Focus Questions: Why do cells need to grow and divide?
How do cells divide?
What happens when cells divide incorrectly?

2. Reasons we need our cells to grow!
_____________________ of organisms
________________ of tissues

3. There are limits to a cell’s growth
A larger cell may experience “_________ ______________”
As cells get __________________ they become less ________________ at exchanging nutrients and materials such as oxygen, water, and food with its ________________________

4. DNA Overload
If a cell is large, there are more demands on its single copy of __________________
Think of a book in a library: the more people there are, the greater the likelihood that they will have to ________________ to read it

5. Exchanging Nutrients As a cell gets larger, what gets bigger?
Its ________________
Its ___________________ _____________ also gets larger, but not large enough!
Only so many materials are able to pass through the cell membrane at once
The surface area of many small cells is greater than one cell (or ever a few large cells)

6. Remember, cells must use diffusion and osmosis to obtain important nutrients, like ______________ and __________________

7. Cell Division - process by which a cell splits into two identical ________________ ______________
Occurs in two main phases: 
Interphase – cell _______________ its DNA and prepares for division
Mitosis – chromosomes separate into ______ _________ cells

8. Chromosomes DNA containing cell’s genetic code
During interphase, chromosomes are copied
- this produces two identical “sister __________________________”

10. The Cell Cycle

11. The Cell Cycle Interphase (longest phase)
G1 - first growth (gap) phase, new organelles produced
Synthesis - DNA makes a copy
G2 - second growth (gap) phase, preparing for mitosis
G0 - no growth phase, a cell may enter this phase
Mitosis - nucleus divides, ensuring each new cell has the exact number of chromosomes as parent