Midterm 2 exam from 2004 corrected

Midterm 2 exam from 2004 corrected - BME 499 “Biophysical...

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BME 499 “Biophysical Chemistry” Name:______________________________ Mid-term exam II, Nov. 15, 2004 Choose 14 out of 17 questions. Mark clearly the questions that you chose. 1) What is the benefit for cells to couple reactions in metabolism from the point of view bioenergetics? (1P) . Name an example for a coupled process in biochemistry (1P) ? 2a) Is the pH in the matrix of active mitochondria acidic (< pH 6.6), neutral (pH 6.8-7.5) or basic (> 7.6)? (1P) ? b) Explain (1P) . 3) How do mitochondria produce most of the ATP (2P) ?
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4a) Is the pH in the thylakoid lumen of active chloroplasts acidic (< pH 6.6), neutral (pH 6.8-7.5) or basic (> 7.6)? (1P) ? b) Explain (1P) . 5) What is the ionic strength of a solution that contains 0.1 M KCl and 0.05 M MgCl 2 (1P) ? 6a) Calculate the pH of 0.010 M CH 3 CH(OH)COOH (aq) (lactic acid). The K a of lactic acid is 8.4·10 -4 (1P) ? b) What would be the pH after adding 1 mL of 1.00 M NaOH to 1 L of this lactic acid solution (1P) ?
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7) The “Pol B subunit” near the active site of DNA polymerase is lined with several
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Midterm 2 exam from 2004 corrected - BME 499 “Biophysical...

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