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| Question | Answer |
| What is the cell membrane composed of? | Lipid and protein. |
| What two words can describe the cell membrane? | Selectively permeable. |
| What is the difference in a concentration of a substance called? | The concentration gradient. |
| What is passive transport? | Substance doesn't require additional energy to move. The movement of molecules down the concentration gradient (from high to low) |
| What are the two examples of passive transport? | Diffusion and osmosis. |
| What is diffusion? | The movement of substances from a high concentration to a low concentration down a concentration gradient. |
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