4. The diagram below represents an agar plate with 2 holes cut in it, A and B. I

Question

4. The diagram below represents an agar plate with 2 holes cut in it, A and B. If a blue solution containing molecules with a molecular weight of 121.5 was placed in spot A and a red solution containing molecules with a molecular weight of 74.2 was placed in spot B, which color molecule would reach the center first? Why? 5. Review your notes about the photographs of cells that you observed. A. Name the 3 basic geometric shapes that most cells have. B. Based on your results in the lab on diffusion, why do you think most cells are never larger than about 100 um? C. Larger cells, like the amoeba (-500 jum in length), have certain characteristics that allow diffusion across the plasma membrane to still occur rapidly enough for the cell to survive. Based on what you have learned in the lab about the surface area to volume ratio of cells, what characteristic do you see in the photograph of the amoeba to the right that explains why it can get so large and still survive?

Explanation / Answer

Question 4; As the molecular weight is inversely proportional to the diffusion

The dye which diffuses faster would reach first

So molecular weight of solution B that is red solution is less so it’s rate of diffusion is more and it reaches first

The lighter the molecular weight, the faster the diffusion rate.

Question 5;

Cells are present in various shapes

Smaller size of the cell presents a larger surface area/volume ratio.

The larger surface area relative to volume of the cell ensures greater diffusion of:

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