2. Neither!!! Their cells are the same size… this one just has MORE!

3. There are two main reason why cells divide instead of continue to grow: 1. The larger the cell becomes, the more demands the cell places on its DNA 2. The cell has more trouble moving enough nutrients and wastes across the cell membrane.

4.  Information that controls a cell’s function is stored in a molecule knows as DNA  In eukaryotic cells, DNA is found in the nucleus

5.  When a cell is small, the information stored in the DNA is able to meet all of the cell’s needs  If a cell was too large an “information crisis” would occur and the cell would not function properly

7.  Food, water and nutrients enter the cell through its cell membrane  Waste products leave in the same way

8. Example: Small streets in a big town

9.  The relationship between a cell’s volume and its surface area is the key to understanding why cells must divide as they grow!

11.  The volume increases much faster than the surface area, causing the ratio of surface area to volume to decrease.  This decrease creates serious problems for the cell. Formula for calculating ratio: Ratio = Surface Area/Volume

12. CAN WE FIND THIS EXPERIMENTALLY??? Problem: What happens to the surface/volume ratio when a cube gets really big? Background: 1. How do you find surface area? Volume? Ratio? Hypothesis: Materials: pg 275 in book Methods: Result table in excel: Conclusion: