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biology ch. 7 terms

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Term
Definition
cellular respiration   the process by which cells produce energy from carbohydrates; atmospheric oxygen combines with glucose to form water and carbon dioxide  
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pyruvic acid   the three-carbon compound that is produced during glycolysis and needed for both the aerobic and anaerobic pathways of cellular respiration that follow glycolysis  
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NADH   the reduced form of NAD+; an electron-carrying molecule that functions in cellular respiration  
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anaerobic   describes a process that does not require oxygen  
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aerobic respiration   if oxygen is present in the cell's environment, pyruvic acid is broken down and NADH is used to make a large amount of ATP through the process  
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glycolysis   the anaerobic breakdown of glucose pyruvic acid, which makes a small amount of energy available to cells in the form of ATP  
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NAD+   nicotinamide adenine dinucleotide, an organic molecule that serves as an electron carrier by being oxidized to NAD+ and reduced to NADH  
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fermentation   the breakdown of carbohydrates by enzymes, bacteria, yeasts, or mold in the absence of oxygen  
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lactic acid fermentation   the chemical breakdown of carbohydrates that produces lactic acid as the main end product  
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alcoholic fermentation   the anaerobic process by which yeasts and other microorganisms break down sugars to form carbon dioxide and ethanol  
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kilocalorie   a unit of energy equal to 1,000 cal  
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mitochondrial matrix   the fluid that is inside the inner membrane of a mitochondrion  
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acetyl CoA   acetyl coenzyme A, a compound that is synthesized by cells and that plays a major role in metabolism  
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Krebs Cycle   a series of biochemical reactions that convert pyruvic acid into carbon dioxide and water; it is the major pathway of oxidation in animal, bacterial, and plant cells, and it releases energy  
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oxaloacetic acid   a four-carbon compound of Krebs cycle that combines with acetyl CoA to form citric acid  
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citric acid   a six-carbon compound formed in the Krebs cycle  
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FAD   flavin adenine dinucleotide, a compound that acts as a hydrogen acceptor in dehydrogenation reactions  
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