# exam III answers - Name page 1 BioSci 1000 exam III Student...

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Name ____________________________ page 1 BioSci 1000 exam III Student # ________________ Exam III – Schwacha 100 points total 11/24/09 1. Print your name on each page 2. Read each question carefully 3. Answer each question in ink only and write legibly 4. Remember to sign the class list when you turn in your exam. 5. Use a sheet of blank paper (at rear to exam) to cover your answers as you work. 6. Good luck! 7. Have a good Thanksgiving! Calculators are NOT allowed or required. __________________________________________________________________ Physical constants that may or may not be helpful Boltzmann Constant, k = 1.381 X 10 -23 J/K Avogadro’s number, N =6.022 X 10 23 mol -1 Faraday’s constant, F = 96.48 kJ V -1 . mol -1 Gas constant = R=8.315 j/mol . K 25 o C = 298 K ln10 = 2.3; log 10=1; log 1 = 0 speed of light in a vacuum = 299,792,458 m/sec The gravitational constant G = 6.6742* 10 -11 m 3 s -2 kg -1 The cube root of 42 = 3.47

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Name ____________________________ page 2 BioSci 1000 exam III Multiple choice and fill in – circle or write in the BEST answer (2 points each) 1. Almost all of the oxygen (O 2 ) one consumes in breathing is converted to: (2 pts) A) acetyl-CoA. B) carbon dioxide (CO 2 ). C) carbon monoxide and then to carbon dioxide. D) none of the above. E) water. 2. In the reoxidation of QH 2 by purified ubiquinone-cytochrome c reductase (Complex III) from heart muscle, the overall stoichiometry of the reaction requires 2 mol of cytochrome c per mole of QH 2 because: (2 pts) A) cytochrome c is a one-electron acceptor, whereas QH 2 is a two-electron donor. B) cytochrome c is a two-electron acceptor, whereas QH 2 is a one-electron donor. C) cytochrome c is water soluble and operates between the inner and outer mitochondrial membranes D) heart muscle has a high rate of oxidative metabolism, and therefore requires twice as much cytochrome c as QH 2 for electron transfer to proceed normally. E) two molecules of cytochrome c must first combine physically before they are catalytically active. 3. Which of the following statements about the chemiosmotic theory is correct? (2 pts) A) Electron transfer in mitochondria is accompanied by an asymmetric release of protons on one side of the inner mitochondrial membrane. B) It predicts that oxidative phosphorylation can occur even in the absence of an intact inner mitochondrial membrance. C) The effect of uncoupling reagents is a consequence of their ability to carry electrons through membranes. D) The membrane ATP synthase has no significant role in the chemiosmotic theory. E) All of the above are correct. 4. During oxidative phosphorylation, the proton motive force that is generated by electron transport is used to: (2 pts) A) create a pore in the inner mitochondrial membrane. B)
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exam III answers - Name page 1 BioSci 1000 exam III Student...

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