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Chapter 4 Vocab

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Term
Definition
ATP   high-energy molecule that contains, within its bonds, energy that cells can use  
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ADP   low-energy molecule that can be converted to ATP  
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chemosynthesis   process by which ATP is synthesized by using chemicals as an energy source instead of light  
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photosynthesis   process by which light energy is converted to chemical energy; produces sugar and oxygen form carbon dioxide and water  
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chlorophyll   light-absorbing pigment molecule in photosynthetic organisms  
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thylakoid   membrane-bound structure within chloroplasts that contains chlorophyll and other light-absorbing pigments used in light-dependent reactions of photosynthesis  
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light-dependent reactions   part of photosynthesis that absorbs energy from sunlight and transfers energy to the light-independent reactions  
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light-independent reactions   part of photosynthesis that uses energy absorbed during the light-dependent reactions to synthesize carbohydrates  
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photosystem   series of light-absorbing pigments and proteins that capture and transfer energy in the thylakoid membrane  
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electron transport chain   series of proteins in the thylakoid and mitochondrial membranes that aid in converting ADP to ATP by transferring electrons  
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ATP synthase   enzyme that catalyzes the reaction that adds a high-energy phosphate group to ADP to form ATP  
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Calvin cycle   process by which a photosynthetic organism uses energy to synthesize simple sugars to form CO2  
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cellular respiration   process of producing ATP by breaking down carbon-based molecules when oxygen is present  
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aerobic   process that requires oxygen to occur  
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glycolysis   anaerobic process in which glucose is broken down into two molecules of pyruvate and two net ATP are produced  
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anaerobic   process that does not require oxygen to occur  
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Krebs cycle   process during cellular respiration that breaks down a carbon molecule to produce molecules that are used in the electron transport train  
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fermentation   anaerobic process by which ATP is produced by glycolysis  
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lactic acid   product of fermentation in many types of cells, including human muscle cells  
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