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Hoskins/diffusion
diffusion and the cell membrane
| Question | Answer |
|---|---|
| What is diffusion? | movement of molecules to take up all the available space |
| When does diffusion occur across a membrane? | When there is a higher concentration of molecules on one side of the membrane than on the other. |
| How is active transport different from diffusion? | molecules move from low to high concentrations and require ATP (cell energy) to do it |
| Why is the cell membrane said to have selective permeability? | It allows only certain molecules into and out of the cell. |
| What 3 factors influence whether or not a molecule can enter or exit the cell? | 1.Size of particle 2.concentration of particles 3. shape of particle (lock and key - enzymes) |
| What is dynamic equilibrium? | The back and forth movement across a membrane in an effort to balance molecule concentrations |
| How does salt influence the amount of water in a solution? | The more salt dissolved in a solution, the less water molecules are present |
| What is another name for diffusion? | passive transport |
| What are transport molecules? | proteins embedded in the cell membrane that help molecules move through. |
| how do cells communicate with eachother? | send enzymes(key) out of the cell membrane to interact into receptors (Lock) in another cell membrane |
Created by:
lisacandjustinh
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