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

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Transcript
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: