Chemical Compounds In Cells/diffusion

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organic compounds

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contain the element carbon

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passive transport

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the movement of materials through a cell membrane without using energy; materials move from higher to lower concentration through a cell membrane; diffusion and osmosis

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active transport

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refers to the movement of materials through a cell membrane when energy is required

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osmosis

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refers to the movement of water molecules through a selectively permeable membrane

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diffusion

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refers to the movement of molecules from an area of higher concentration to an area of lower concentration; type of passive transport

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enzyme

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refers to proteins that speed up chemical reactions in living things

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starches

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when sugar molecules can combine to form large molecules

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DNA and RNA

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examples of nucleic acids

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nucleic acids

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contain the instructions that cells need to carry out all the functions of life

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sugars and starches

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examples of carbohydrates

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oxygen and carbon dioxide

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examples of molecules that move across cell membranes through a process called diffusion

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fats, oils, and waxes

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examples of lipids

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proteins

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made up of smaller molecules called

amino acids

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element

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any substance that cannot be broken down into simpler substances

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atom

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smallest unit of an element

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molecule

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smallest unit of most compounds

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compound

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when two or more elements combine chemically

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selectively permeable

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means that some substances can pass through it while others cannot

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water

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helps cells keep their size and shape; helps keep the temperature of cells from changing rapidly; allows chemical reactions in cells to take place