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Vocabulary for Topic 1 - Similarities/Differences Among Living Organisms

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Term
Definition
Active Transport   process by which cells use energy to transport molecules through the cell membrane from areas of low to high concentration; requires energy (ATP)  
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Amino Acids   building blocks of protein  
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Cell   basic unit of structure and function that makes up all organisms  
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Cell Membrane   thin boundary between the cell and its environment  
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Cell Respiration   process in which nutrients are broken apart; release chemical energy  
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Chloroplast   green organelle that contains chlorophyll; photosynthesis takes place here  
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Circulation   flow of materials within a cell and between parts of organisms  
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Cytoplasm   jellylike substance that is between the cell membrane; contains specialized structures  
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Diffusion   movement of molecule from area of high to low concentration  
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Digestion   process that breaks down large food molecules into simpler molecules that organism can use  
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Enzymes   proteins that speed up the rate of chemical reactions  
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Excretion   the removal of all the wastes produced by the cell  
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Homeostasis   maintain a stable internal environment  
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Hormone   chemical produced by in the endocrine glands  
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Immunity   body's ability to destroy pathogens before they cause disease  
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Inorganic   does not contain both carbon and hydrogen  
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Metabolism   all chemical reactions that occur within the cells of an organism  
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Mitochondria   powerhouse for the cell; provides energy  
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Nucleus   contains genetic information, including chromosomes and DNA  
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Organ   body structure made of different kinds of tissues combined to perform a specific function  
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Organ System   several organs that work together to perform a major function in the body  
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Organelle   a structure within the cell that carries out a specific function  
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Organic   contain both hydrogen and carbon  
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Receptor Molecule   certain protein molecules in the cell membrane that can receive chemical messages from other cells; shape specific (match shapes)  
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Respiration   process by which the chemical bond energy stored in nutrients is released for use in cells  
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Reproduction   process by which organisms produce new organisms of same type  
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Ribosome   make proteins  
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Simple Sugars   result of digested starches  
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Synthesis   life process that involves combining simple substances into more complex substances  
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Tissue   a group of specialized cells that perform a specific function  
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Vacuole   storage sacs of the cell  
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