Fall+2005+Final - BME 499 Biophysical Chemistry Final Exam,...

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BME 499 “Biophysical Chemistry” Name: ______________________________ Final Exam, Dec. 12, 2005 Use N A = 6.022 10 23 for all calculations with Avogadro’s number Note, if you cannot solve parts of problems, then assume reasonable values and proceed with the following parts of the problem. 1) For most salts, when you dissolve a large amount of them in an aqueous solution then the solution gets warm. There are, however, a few kinds of salts, which also dissolve but the solution cools down during that process. 1a) Is G for the dissolving process positive or negative for those latter salts? ( 2P ) 1b) Explain your answer ( 2P ). 1c) What do you think is the driving force for these latter salts to dissolve? ( 2P ) 1d) Explain ( 4P ). 2) 2a) What do cells accomplish by coupling reactions? ( 3P ) 2b) Name two examples and what is accomplished? ( 4P )
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3) Several cancer cells have an abnormally increased number of folate receptors (a protein molecule that binds folate) on their surface compared to non-cancer cells. 3a) How could you find out if the cells that you grew in your laboratory may be such cancer cells? Explain your experiment (make sure the essential steps of the experiment are included and think carefully about your experiment since cells represent a complex systems. In other words try to make sure that the result from your experiment will be specific for the question you are trying to answer). ( 10P )?
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4) 4a) Do you think that the following reaction is spontaneous as written, Li + (aq) + Fe 2+ (aq) → Fe 3+ (aq) + Li(s), if the standard reduction potential of the redox couple Li + /Li is E 0 = –3.05 V and the standard reduction potential of the couple Fe 3+ /Fe 2+ is E 0 = +0.77V ( 2P ). 4b) Explain (
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Fall+2005+Final - BME 499 Biophysical Chemistry Final Exam,...

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