Post - Lecture Assignment 2:27 PDF

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Post – Lecture Assignment 2/27 Whether an organism is classified as a photoheterotroph or a photoautotroph depends on its Carbon Source In photosynthesis, NADH and NADPH are produced from NAD + and NADP+ by Reduction Reactions Some purple bacteria harvest light using bacteriochlorophylls True Which of the following types of organisms uses hydrogen sulfide for reducing power? Purple Sulfur Bacteria In which organism would you likely find a chlorosome? Green Sulfur Bacteria Which of the following is a bacterium that performs oxygenic photosynthesis? Cyanobacteria What is the key difference between photoheterotrophs and photoautotrophs? Photoheterotrophs use organic compounds as their carbon source; photoautotrophs use carbon dioxide as their carbon source. Which of the following is a trait unique to photosynthetic eukaryotes? The presence of chloroplasts What is the role of light energy in photosynthesis? To produce a proton gradient to make ATP Which of the following is used in photosynthesis by both plants and cyanobacteria? Water, Sunlight, and Carbon Dioxide What molecule is used to capture light energy? Chlorophyll Each chlorophyll and bacteriochlorophyll type is distinguished by its absorption spectrum. True Why is the Calvin-Benson cycle also termed the "light independent reactions" of photosynthesis? Sunlight is not directly needed to carry out this process What is the source of the electrons that reduce 1,3-bisphosphoglyceric acid? NADPH What is the key product formed by the Calvin-Benson cycle? G3P How many of the six G3P’s produced in one cycle are used to make one molecule of glucose? One

Post – Lecture Assignment 2/27 What is the net total (gain or loss) of ATP after one cycle? Loss of Nine What best describes the methanogens? They are a diverse group that is spread across at least 7 orders What is the largest carbon reservoir on Earth? Rocks and Sedimentation The largest reservoir of methane is found As methane hydrates trapped under permafrost and marine sediments. Human activities have disrupted the carbon cycle by Burning carbon stored as fossil fuels or biomass, thus increasing the amount of carbon dioxide in the atmosphere. In a global sense, all nutrient cycles are coupled together. True Nitrogen fixation results in the Addition of biologically available N to an ecosystem. What is the major reservoir of stable nitrogen? N2 The metabolic process of denitrification Reduces NO3The metabolic process of ammonification ________ ammonia. Produces Agricultural application of nitrogen fertilizer Increases global warming by increasing the production of nitrous oxide (N2O) by denitrification in agricultural soils. Ocean has mitigated the impact of anthropogenic carbon dioxide production by Absorbing 500 billion tons of atmospheric carbon dioxide and over 80% of the trapped heat energy...