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Cells and Energy Vocabulary

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Term
Definition
ATP   A molecule that transfers energy from the breakdown of food molecules to cell processes.  
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ADP   A lower-energy molecule that can be converted into ATP by adding a phosphate group.  
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Chemosynthesis   A process by which some organisms use chemical energy instead of light energy to make energy-storing carbon-based molecules.  
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Photosynthesis   A process that captures energy from sunlight to make sugars that store chemical energy.  
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Chlorophyll   A molecule in chloroplasts that absorbs some of the energy in visible light.  
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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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Calvin cycle   Process by which a photosynthetic organism uses energy to synthesize simple sugars from 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 chain.  
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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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