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Download Limit to Cell Growth Notes Which turtle has bigger cells?
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Neither!!! Their cells are the same size… this one just has MORE! 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. Information that controls a cell’s function is stored in a molecule knows as DNA In eukaryotic cells, DNA is found in the nucleus 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 Food, water and nutrients enter the cell through its cell membrane Waste products leave in the same way Example: Small streets in a big town The relationship between a cell’s volume and its surface area is the key to understanding why cells must divide as they grow! 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 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: