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march bio ch 4 key terms

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Key Term
Definition
autotroph   organisms that make their own food; plants, algae  
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heterotroph   depend on autotrophs for food supply; includes animals, most bacteria, and fungi  
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adenosine triphosphate (ATP)   a molecule made up of a simple sugar, adenine, and 3 phosphates; represents stored energy  
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adenosine diphosphate (ADP)   the same molecule as ATP with only 2 phosphates; represents released energy  
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photosynthesis   the process where most autotrophs make their own food  
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chlorophyll   green pigjment found in chloroplasts of green plants and algae  
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light-dependent phase   also called light reactions; occurs in grana of chloroplast  
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photolysis   the splitting of water by light energy  
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light-independent phase   also called the dark phase, synthetic phase, Calvin cycle, and carbon fixation cycle; occurs in stroma of chloroplasts  
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cellular respiration   the breaking down of a food substance (usually glucose) into usable cellular energy in the form of ATP  
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aerobic cellular respiration   requires oxygen to occur  
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anaerobic cellular respiration   does not require oxygen  
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glycolysis   initial breakdown of glucose into pyruvic acid; does not require oxygen  
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Citric Acid Cycle (Krebs Cycle)   pyruvic acid is converted to acetyl coenzyme A, which is converted to citric acid  
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cellular fermentation   the breakdown of glucose without oxygen  
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metabolism   the sum of all of a cell's life processes  
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codons   the DNA bases (adenine, thymine, guanine, and cytosine) arranged in groups of 3; there are 64 combiniatin to code for the 20 amino acids  
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transcription   the conversion of DNA code into RNA code  
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messenger RNA (mRNA)   contains actual code fro transcription  
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transfer RNA (tRNA)   transfers amino acids from cytoplasm to ribosomes  
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ribosomal RNA (rRNA)   combines with various proteins to form a ribosome  
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translation   the process of forming a polypeptide chain of amino acids  
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metabolic rate   the rate at which an organism carries on its life processes  
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anabolism   the building of molecules to store energy  
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catabolism   the breaking down of molecules to release energy  
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intracellular digestion   digestion of food inside of cells  
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extracellular digestion   digestion of food outside of cells  
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autophagy   digestion of cellular structures that are damaged, worn out, or no longer needed  
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