quiz3_4_21 - 7.014 Quiz III Your Name TA's Name Write your...

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7.014 Quiz III 4/22/05 Your Name : _________________________________ TA's Name: Write your name on this page and your initials on all the other pages in the space provided. This exam has 10 pages including this coversheet. Check that you have pages 1-10. This exam has 4 questions. Read all questions before starting to write. Write your answers as clearly and precisely as possible in the space provided. This is a closed book exam. Question Value Score 1 20 2 22 3 30 4 28 TOTAL: 100
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Name:________________________________________ TA:____________________ 2 Question 1 (20 points) The table below lists types of metabolism in the left column. Type of metabolism Electron source Carbon source Energy source fermentation sulfur oxidation chemosynthesis oxygenic photosynthesis anaerobic respiration nitrification chemosynthesis aerobic respiration anoxygenic photosynthesis a) For each type of metabolism, i) use the following list to fill in Electron source (column 2) and Carbon source (column 3) in the table above. A. sugar (Note, “sugar” here is a generic term for any organic carbon compound (CH 2 O) n ). B. Water (H 2 O) C. hydrogen sulfide (H 2 S) D. methane (CH 4 ) E. carbon dioxide (CO 2 ) F. NH 3 ii) fill in Energy source (column 4) in the table above. For this part, you are not limited to the list above. b) For a number of the metabolisms above, the electron source is the same as the energy source. Explain why they are not the same for photosynthesis. donor c) Organisms carrying out respiration need a final electron acceptor to keep the electron transport chain (ETC) functional. (Circle the correct term above.) Explain how this compound enables the ETC to remain functional.
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Name:________________________________________ TA:____________________ 3 Question 1, continued d) Using an argument based on redox and energetics, explain how aerobic respiration generates more ATP per molecule of glucose than anaerobic respiration. Question 2 (22 points) Baby Jill is stuck on an uninhabited island. The food web quickly comes to look like this: In this web, NPP (plants)=200 kg/day I M (Mice ingestion) = 20kg/day Mice AE (assimilation efficiency) = 20% Mice PE (production efficiency) =10% Ferret EE (exploitation efficiency) = 50% Ferret AE = 80% Ferret PE = 10% Baby Jill EE = 40% Baby Jill AE = 80% Baby Jill PE =10% Detritus Ferrets Baby Jill Mice Plants
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Name:________________________________________ TA:____________________ 4 Question 2, continued a) Suppose that shortly after baby Jill’s arrival the flow into the refractory carbon pool in the system decreased. Why was there a decrease?
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