Question

In a diffusion investigation, a student submerges an agar cube with phenolphthalein in acetic acid. Phenolphthalein changes from pink to clear in the presence of an acid. As the acid diffuses into the cube, the cube turns from pink to clear, so the depth of diffusion can be measured. The data presented below is for three different sized cubes used in this experiment. Size of cube Depth of diffusion 1 cm 0.5 cm 2 cm 0.5 cm 3 cm 0.5 cm Based on the data, which of the following best supports the claim that there is an evolutionary constraint on cell size? a. The volume of a cell increases as materials diffuse into it, allowing for a faster rate of diffusion. b. The formation of organelles increases as cell size increases. c. The size of the cube increases as the depth of diffusion increases. d. The rate of diffusion is the same regardless of cell size, thus limiting how large a cell can become.

          In a diffusion investigation, a student submerges an agar cube with phenolphthalein in acetic acid.  Phenolphthalein changes from pink to clear in the presence of an acid.  As the acid diffuses into the cube, the cube turns from pink to clear, so the depth of diffusion can be measured.  The data presented below is for three different sized cubes used in this experiment. 
Size of cube	Depth of diffusion
1 cm	0.5 cm
2 cm	0.5 cm
3 cm	0.5 cm

Based on the data, which of the following best supports the claim that there is an evolutionary constraint on cell size?  
a.	The volume of a cell increases as materials diffuse into it, allowing for a faster rate of diffusion.
b.	The formation of organelles increases as cell size increases.
c.	The size of the cube increases as the depth of diffusion increases.
d.	The rate of diffusion is the same regardless of cell size, thus limiting how large a cell can become.

Added by Dennis R.

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