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| smallest basic unit of matter |
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| can't be broken down into a simpler substance |
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| made of atoms of different elements bonded together in a certain ratio |
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| a region with a positive charge and a region with a negative charge |
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| Attraction between molecules of the same substance |
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| An attraction between molecules of different substances |
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| macromolecules that are found in living things |
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| the building of large compounds by joining smaller ones together with the removal of water |
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| molecules composed of carbon, hydrogen, and oxygen and they include sugars and starches |
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| non-polar molecules (do not mix well with water) that include fats, oils, waxes, and cholesterol |
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| the specific reactants that an enzyme acts on |
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| The specific places where substrates temporarily bind to enzymes |
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| molecules that contain carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur |
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| an attraction between a slightly positive hydrogen atom and a slightly negative atom, often oxygen or nitrogen |
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| the amount of energy that needs to be absorbed for a chemical reaction to start |
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| a substance that decreases the activation energy needed to start a chemical reaction and, as a result, also increases the rate of the chemical reaction |
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| catalysts for chemical reactions in living things |
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| when atoms share a pair of electrons |
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| forms through the electrical force between oppositely charged ions |
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