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Chapter 10 Key Terms 1

Chapter 10 Key Terms 1 - involving fixation of atmospheric...

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Chapter 10 Key Terms Autotroph (ot´-o-trof) An organism that obtains organic food molecules without eating other organisms or substances derived from other organisms. Autotrophs use energy from the sun or from the oxidation of inorganic substances to make organic molecules from inorganic ones. Heterotroph (het´-er-o-trof) An organism that obtains organic food molecules by eating other organisms or substances derived from them. Photoautotroph (fo'-to-ot'-o-trof) An organism that harnesses light energy to drive the synthesis of organic compounds from carbon dioxide. carbon fixation The initial incorporation of carbon from CO2 into an organic compound by an autotrophic organism (a plant, another photosynthetic organism, or a chemoautotrophic prokaryote). Calvin cycle The second of two major stages in photosynthesis (following the light reactions),
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Unformatted text preview: involving fixation of atmospheric CO2 and reduction of the fixed carbon into carbohydrate. Rubisco (ru-bis'-ko) Ribulose bisphosphate (RuBP) carboxylase, the enzyme that catalyzes the first step of the Calvin cycle (the addition of CO2 to RuBP). C3 plant A plant that uses the Calvin cycle for the initial steps that incorporate CO2 into organic material, forming a three-carbon compound as the first stable intermediate. C4 plant A plant in which the Calvin cycle is preceded by reactions that incorporate CO2 into a four-carbon compound, the end product of which supplies CO2 for the Calvin cycle. bundle-sheath cell in C4 plants, a type of photosynthetic cell arranged into tightly packed sheaths around the veins of A leaf. CAM plant A plant that uses crassulacean acid metabolism, an adaptation for photosynthesis in arid...
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