ps5s - MIT Department of Biology 7.014 Introductory...

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2 + MIT Department of Biology 7.014 Introductory Biology, Spring 2004 Solutions to 7.014 Problem Set 5 Question 1 a) Fill in the following table: Process: Energy Source: Carbon Source: Anaerobic Photosynthesis Sunlight CO 2 Aerobic Photosynthesis Sunlight CO 2 Chemosynthesis Reduced chemical compounds CO 2 Aerobic Respiration Organic carbon compounds like glucose Organic carbon compounds like glucose Lactic Acid Fermentation Organic carbon compounds like glucose Organic carbon compounds like glucose b) You've been stranded on a deserted island with the following: 1) a heterotroph that carries out anaerobic respiration 2) an autotroph that carries out chemosynthesis 3) an autotroph that carries out oxygenic photosynthesis For each of the transformations below, indicate which organism(s) would be responsible for the conversion. Fe Fe 2 + 3 + O 2 2 2 1 2, 3 2, 3 2 3 1, 2, 3 H O organic C CO 1
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Question 1, continued c) Fill in the blanks on the following graph and indicate which type of metabolism this organism is using. H + gradient NADH + H + NAD + CO 2 glucose e e O 2 H O 2 ADP + P i ATP Metabolism = aerobic respiration d) Consider the metabolism diagrammed below: 1 - SO 4 2- e O 2 3 2 H S H 2 O 2 H + gradient ADP + P i NADP + NADPH ATP e - 2 H S SO 4 2 - 4 i) This type of metabolism is an example of chemosynthesis . It is most commonly carried out by prokaryotic organisms. These organisms are auto trophs. ii) What is the energy stored in the ATP and the NADPH produced in the metabolism above used for? To fuel the Calvin cycle, fix CO 2 into glucose. 2
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Question 2 Your ongoing interest in bioluminescent organisms has lead you to study the Hawaiian squid, Euprymna scolopes . Most nocturnal creatures cast shadows under the bright Hawaiian moonlight, and are easy prey to predatory fish. This type of squid can shine light downwards to match the moonlight and avoid casting a shadow thereby decreasing predation. To provide squid for your studies, you maintain a large, self-supporting squid tank. The food web of the tank is shown below. phytoplankton small fish squid detritivores When your tank is at steady state, you can harvest 10 kg of squid carbon/week and all the other biomasses (phytoplankton, fish, squid, and detritivores) remain constant. Given the following values: • NPP of phytoplankton = 2.0 kilograms of organic carbon per gram of phytoplankton per day • plant production efficiency = 60% • fish exploitation efficiency = 50% • fish assimilation efficiency = 20% • fish net production efficiency = 5% • squid exploitation efficiency = 50% • squid assimilation efficiency = 80% • squid net production efficiency = 40% a) What NPP (in kilograms of carbon) is required to support a harvest of 10 kg of squid carbon per week at steady state? Show your work.
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This note was uploaded on 05/02/2009 for the course BIOL 7.014 taught by Professor Walker during the Spring '05 term at MIT.

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ps5s - MIT Department of Biology 7.014 Introductory...

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