CHEM 471 Midterm: CHEM 471 UMass Amherst Exam4 KEY 2010
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Name:___________ key ____________: the terminal step in the respiratory electron transfer chain is the transfer of electrons from the heme iron in cytochrome c to o2. Use the following reduction potentials to answer the questions below. Cyt c [feiii] + e- cyt c [feii] 0"= - 0. 254 v: write a balanced chemical equation for the reduction of oxygen by cytochrome c. O2 + 4 h+ + 4 e- 2h2o. 4cyt c [feii] 4cyt c [feiii] + 4e- Assume t=37 c, ph = 7 inside, ph = 8 outside, and the potential difference (voltage outside voltage inside) = 140 mv. A = (8. 3145j / k mol)(310k )ln. + (1)(96, 500 j / molv )(0. 14v ) Name:__________key____________: suppose you are studying a protein (p) with 4 binding sites for its ligand (l). [l]free, in = [l]free, out. [l]bound, in = [l]tot, in [l]free,, in. Osmotic pressure is determined by the species that can"t cross the membrane, so use [p]tot.
