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  3. 10 09 e 08 07 0 30 60 90 120...

Question: 10 09 e 08 07 0 30 60 90 120...

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1.0 0.9 E 0.8 0.7 0 30 60 90 120 Time (min)3. Yeast which grow on grapes exhibit large changes in the exterior osmotic pressure as envi ronmental conditions change, for example from a sudden rainfall. You will make an order of magnitude estimate of how much work is done and the power output of yeast when they recover from an osmotic shock. In a typical laboratory experiment on osmotic shock, the osmotic pressure exterior to a cell is increased by adding 0.5 M NaCl to the surrounding solution. a) What is the additional pressure across the cell membrane due to the added salt in the solution? (b) What is the total force on the interior of the cell the moment the cell experiences the shock? Consider the experimentally measured yeast volume recovery curve (below) (c) What is the change in the average radius of the the cell from its minimum during the osmotic shock to the recovered radius? (d) During the cell recovery, how much work must be done? To get an order of magnitude approximation, we need to start by making some very simplifying assumptions. For example, you could assume that the force exerted by the cell on its membrane doesnt change as the cell recovers. Explicitly list which assumptions you are making. (e) How many molecules of ATP must be consumed if the cell does this work perfectly efficiently? (f) What is a typical power output of the cell during recovery?

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