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Unformatted text preview: Surface area = (4)(pi)(100 um 2 ) = 1.256 x 10 3 um 2 c. What do you think the approximate mass (weight) of this cell could be? Since the density of distilled water = 1.0 g/ml, and the cell is ~75% water, weight estimates can be made as follows: if cell is 100% water it would weigh 4.2 nanograms (4.2 x 109 grams). But since it is 75% water and 25% protein, nucleic acid, and other macromolecules that have a density greater than 1.0 g/ml, estimated weight would be something greater than 4.2 nanograms. For example, 7 9 nanograms / cell would be a reasonable estimate. d. What do you think is the largest cell type in your body? The smallest type? Largest = egg (oocyte) if you are female. Smallest = spermatozoan if you are male....
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 Spring '08
 Scholey

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