Download Limit to Cell Growth Notes Which turtle has bigger cells?

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: