Midterm 2 retry part one

Midterm 2 retry part one - Mic102 Fall 2010-Midterm 2 retry...

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Mic102 Fall 2010--Midterm 2 retry. I would like you to hand in ONLY the accompanying pictures, with the numbered blanks correctly filled in. However, there are questions that you should answer before filling in the blanks—you should find them ridiculously easy, and I do not want to see your answers to them. This CLOSED BOOK , and is to represent ONLY your own work. These questions have to do with the paper “Nitrite, an Electron Donor for Anoxygenic Photosynthesis.” By Griffin et al. In this paper, an organism was isolated from sewage in the city of Konstanz, Germany, and found to use nitrite to support its photoautotrophic growth. This organism, called KS, has just photosystem II, and exclusively uses cyclic photophosphorylation for producing a proton gradient and ATP. 1. In any redox reaction, if one thing is getting reduced, then another thing a) must get reduced, too b) must get oxidized. 2. The reaction ATP ADP + Pi does not involve the transfer of electrons. ATP is nowhere on the redox table. Is the hydrolysis of ATP a redox reaction? a) yes b) no 3. In which reaction is carbon getting reduced? a) glucose CO2 b) glucose Acetyl-CoA and CO2 c) ribulose-1,5-bisphosphate + CO2 glucose d) acetyl-CoA CO2 4. Which form of a compound can serve as an electron donor? a) the reduced form b) the oxidized form 5. On the redox table, where do you find the oxidized form of a compound? a) on the right side b) on the left side 6. On the redox table, where do you find electron acceptors? a) on the right side b) on the left side 6. If you had a compound on the redox table that you wished to use as an electron acceptor, where would you look for a thermodynamically possible electron donor? a) up and to the left b) up and to the right c) down and to the left d) down and to the right
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7. If a question is asking whether a compound can serve as an electron donor for a reaction, your first instinct should be a) guess b) rely on your memory c) check the redox table/answer key 8. The growth of KS requires reducing CO2 to make biomass. The E 0 ’ for this reaction is -0.32 V. Which electron donor could KS use for this reaction? a) NADPH b) NADH c) reduced Ubiquinone (Quinol) d) ATP e) any of the above. Bearing in mind the answer to question 1, put the answer to this question in either box #1 or #2 in the picture. 9. After the electron donor in question 8 has given up its electron, what is the result? Bearing in mind the answer to question 5, put the answer to this question in either box #1 or #2 in the picture 10. Photosystem II energizes electrons, putting them on the reduced form of a quinone, at about +0.1V. Bearing in mind the answer to question 7, is it possible for the reduced quinone to give its electron to NADP+, reducing it to NADPH? a) yes
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This note was uploaded on 04/05/2011 for the course MIC 102 taught by Professor Appleman during the Fall '08 term at UC Davis.

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Midterm 2 retry part one - Mic102 Fall 2010-Midterm 2 retry...

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