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microbiology Help

oceansweet

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14 years ago

microbiology Help

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duddy

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Staff Member

14 years ago

In which direction (into or out of the cell) will water flow in cells of Escherichia coli suddenly suspended into a solution of 20% NaCl? What if the cells were suspended into distilled water? If growth nutrients were added to each cell suspension, which, if either, would be able to grow and why?

The water would flow out of the cell because it is in a hypertonic solution. If it were in distilled water (no solutes), water will flow into the cell because there is a higher concentration of solutes inside the cell. For the last question, it depends on the nutrients and how much is added. For instance, if the nutrients are solutes, such as salts, then water will flow out of the cell and the cell will not benefit from it. However, if I were to guess, I would say that the cells in the distilled water suspension will benefit more suddenly there are more solutes outside the cell, thus making it a hypertonic soltuion.

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