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Biology Ch. 8

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Term
Definition
Adenosine Triphosphate (ATP)   Compound used by cells to store and release energy  
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Heterotroph   Organism that obtains food by consuming other living things; also called a consumer  
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Autotroph   Organism that is able to capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer.  
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Photosynthesis   Process used by plants and other autotrophs to capture light energy and use it to power chemical reactions that convert carbon dioxide and water into oxygen and energy-rich carbohydrates such as sugars and starches.  
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Pigment   Light-absorbing molecule used by plants to gather the sun's energy.  
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Chlorophyll   Principal pigment of plants and other photosynthetic organisms  
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Thylakoid   Sac-like photosynthetic membranes found in chloroplasts.  
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Stroma   Fluid portion of the chloroplast; outside of the thylakoids.  
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NADP+   Carrier molecule that transfers high-energy electrons from chlorophyll to other molecules. (nicotinamide adenine dinucleotide phosphate)  
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Light-Dependent Reactions   Set of reactions in photosynthesis that use energy from light to produce ATP and NADPH.  
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Light-Independent Reactions   Set of reactions in photosynthesis that do not require light; energy from ATP and NADPH is used to build high-energy compounds such as sugar; also called the Calvin Cycle.  
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Photosystem   Cluster of chlorophyll and proteins found in thylakoid.  
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Electron Transport Chain   Series of electron carrier proteins that shuttle high-energy electrons during ATP-generating reactions  
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ATP Synthase   Cluster of proteins that span the cell membrane and allow hydrogen ions (H+) to pass through it.  
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Calvin Cycle   Light-independent reactions of photosynthesis in which energy from ATP and NADPH is used to build high-energy compounds such as sugar.  
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