1. POTATO CELLS LAB Brookings Biology Kelly Riedell

2. MOLECULES ARE TOO TINY TO SEE? How do we know they are there?
Change color to tell you a molecule is present
INDICATORS-
Starch + iodine =
BLACK COLOR

3. “Potato cells” 3 cm 3 cm 1 cm 1 cm 2 cm 2 cm 1 cm 2 cm 3 cm

4. Cut 3 Potato cells of different sizes
Place ALL “cells” into iodine AT SAME TIME.
Cover with lid
Let them sit overnight

5. WHAT WILL HAPPEN?

6. WHAT WILL HAPPEN?

7. Remove "potato cells" from iodine
Place on table
Cut in half
Measure the width of the white square in the middle of the cube

8. Calculate the volume where iodine diffused
BIG OUTSIDE CUBE= TOTAL VOLUME
LITTLE INSIDE CUBE= Volume diffusion didn’t reach
BIG OUTSIDE CUBE – LITTLE INSIDE CUBE = VOLUME REACHED BY DIFFUSION

9. 2 sides are: 1 X 1
4 sides are: 1 X 8
X 2
X 4

10. If having a HIGH SA/VOL RATIO gets the cell what it needs faster, WHAT WOULD BE A GOOD SHAPE TO BE?
How can you increase the surface area of a cell?

11. STRUCTURE/FUNCTION

13. Image modified from: http://www. nature

14. https://upload. wikimedia. org/wikipedia/commons/1/1a/NSRW_Root-Tip

15. https://classconnection. s3. amazonaws

18. WORKS FOR ORGANELLES TOO!

19.
WORKS FOR ORGANS TOO!
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20. WORKS FOR CANCER CELLS TOO!
SEM Image by: Riedell
CHO (Chinese Hamster Ovary) cells in culture