PSET2Q - Name_ Section_ TA_ Please print out this problem...

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Name_____________________________________ Section_______ TA_____________ 1 2010 7.012 Problem Set 2 Please print out this problem set and answer the questions on the printout. Answers to this problem set are to be turned in at the box outside 68-120 before 1:15 pm on Friday, September 24 th . Question 1 E. coli bacteria cells use glucose as an energy source both under aerobic (in the presence of oxygen) and anaerobic (in the absence of oxygen) growth conditions. In the absence of oxygen, these bacteria consume large amounts of glucose. However, their rate of glucose consumption decreases if they are grown in the presence of oxygen. a) Why do the bacterial cells require less glucose for the same growth rate once oxygen is added? An outline of photosynthesis is shown below. b) In a manner analogous to that shown above, i. Complete the diagram for glycolysis: ii. Complete the diagram for the overall process of respiration (respiration = glycolysis + citric acid cycle + oxidative phosphorylation): iii. Glycolysis occurs in the absence of oxygen. What happens to the carbon containing molecule produced in glycolysis when the cell is undergoing fermentation? Is any additional ATP produced? CO 2 ATP ADP Glucose + NADPH O 2 NADP+ H 2 O + Note: For part b) include the names of the following molecules wh e r e app l i cab l e
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Name_____________________________________ Section_______ TA_____________ 2 Question 1, continued c) Oxidative phosphorylation is a series of oxidation-reduction reactions carried out by the proteins of the electron transport chain (ETC). i. What molecule donates electrons to the first protein in the ETC? ii. Name the final electron acceptor used during oxidative phosphorylation in aerobic conditions. Question 2
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PSET2Q - Name_ Section_ TA_ Please print out this problem...

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