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Bio-Unit6-Protists & Energy

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Term
Definition
ATP   an organic molecule that acts as the main energy source for the cell; composed of a nitrogenous base, a sugar, and three phosphate groups.  
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chemosynthesis   the process by which ATP is synthesized by using chemicals as an energy source instead of light  
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photosynthesis   the process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to produce carbohydrates and oxygen  
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chlorophyll   a green pigment that is present in most plant cells, that give plants their characteristic green color, and that reacts with sunlight, carbon dioxide, and water to form carbohydrates.  
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thylakoid   a membrane system found within chloroplasts that contains the components for 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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Calvin cycle   a biochemical pathway of photosynthesis in which carbon dioxide is converted into glucose using ATP( also called the light-independent reactions)  
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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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aerobic   process that requires the presences of oxygen to occur  
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glycolysis   the anaerobic breakdown of glucose into pyruvic acid, which makes a small amount of energy available to cells in the form of ATP  
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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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fermentation   the breakdown of carbohydrates by enzymes, bacteria, yeast or mold in the absence of oxygen  
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lactic acid   product of fermentation in many types of cells, including human muscle cells  
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protist   an organism that belongs to the kingdom protista  
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protozoa   animal-like protist  
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cilia   short hairlike structures that cover some or all of the cell surface and help the organism swim and capture food  
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algae   plant like protist  
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