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6352680-Glossary-Chp7-Photosynthesis - Glossary Chapter 7...

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Glossary How Cells Acquire Energy Chapter 7 absorption spectrum Range of wavelengths that one or more specified pigments can absorb. anthocyanin Blue or red accessory pigment. autotroph Any organism that makes its own food with an environmental energy source (e.g., sunlight) and CO 2 as its carbon source. C3 plant Plant that uses three-carbon PGA as the first intermediate for carbon fixation. C4 plant Plant that uses oxaloacetate (a four-carbon compound) as the first intermediate for carbon fixation. CO 2 is fixed twice, in two cell types; helps counter photorespiration. Calvin-Benson cycle Light-independent cyclic reactions of photosynthesis that form sugars, using ATP energy, NADPH, and CO 2 . CAM plant Type of plant that conserves water by opening stomata only at night, when it fixes carbon dioxide by means of a C 4 pathway. carbon fixation First of the light-independent reactions. Rubisco, an enzyme, affixes carbon (from CO 2 ) to RuBP or to another compound for entry into the Calvin-Benson cycle. carotenoid An accessory pigment of photosynthesis; e.g., fucoxanthin. chemoautotroph Any prokaryotic cell that synthesizes its own food using carbon dioxide as the carbon source and an inorganic substance as the energy source.
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