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ARC science vocabulary test # 21-39

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word
meaning
element   any substance that cannot be broken down into simpler substances  
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atom   the smallest unit of an element  
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compound   two or more elements that are chemically combined  
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Molecule   the smallest unit of most compunds  
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organic compound   a compound that contains carbon  
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carbohydrates   energy- rich organic compounds such as sugars and starches, that are made of the elements, carbon, hydrogen, and oxygen.  
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protien   large organic molecules made of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfer  
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amino acid   small molecules that are linked together chemically to form protiens  
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enzyme   a type of protien that speeds up a chemical reaction in a living thing  
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lipid   Energy- rich organic compounds, such as fats, oils, and waxes, that are made of carbon, hydrogen, and oxygen  
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nucleic acid   a very large organic molecule made of carbon, oxygen, hydrogen, nitrogen, and phosphorus, that contains instructions that cell need to carry out all the functions of life  
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RNA   ribonucliec acid that plays an important role in the production of protiens  
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selectivily permeable   a property of cell membranes that allows some substances to pass through, while others cannot  
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osmosis   the diffusion of water molecules through a cell membrane without using energy  
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passive transport   the movement of matirels through a cell membrane without using energy  
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active transport   the movement of matierals through a cell membrane using energy  
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inorganic compound   a compound that does not contain carbon  
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DNA   Deoxyriboucliec acid; the genetic material that carries information about an organism and is passed down fromm arent to offspring  
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diffusion   the process by which molecules move from an area of higher concentration to an area of lower concentration  
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