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Camponeschi - cells
Camponeschi - Cells target 3
| Question | Answer |
|---|---|
| selectively permeable | some substances can pass through while others cannot |
| What are the three methods substances can move in and out of a cell? | diffusion, osmosis, and active transport |
| diffusion | process by which molecules tend to move from an area of higher concentration to an area of lower concentration (HIGH TO LOW) |
| what causes diffusion | because molecules are always moving and bumping into each other, when they are closer together, they bump into each other more, which spreads them out. |
| Give an example of something that enters the cell through diffusion | oxygen enters cells through diffusion - when the concentration of oxygen is low in a cell, oxygen in water outside the cells diffuses in (from high concentration to low conentration) |
| osmosis | diffusion of water through a selectively permeable membrane |
| How is osmosis related to diffusion? | osmosis is an example of diffusion - it is diffusion of water across a membrane |
| when a cell is sitting in fresh water, where there is a higher concentration of water outside the cell, what will happen? (use the word osmosis in your answer) | through the process of osmosis, water will diffuse into the cell (will diffuse from an area of high concentration - outside the cell, to an area of low concentration - inside the cell) |
| when a cell is sitting in salt water, where there is a higher concentration of water inside the cell, what will happen? (use the word osmosis in your answer) | through the process of osmosis, water will diffuse out of the cell (will diffuse from an area of high concentration - inside the cell, to an area of low concentration - outside the cell) |
| does the cell purposefully control how much water enters and leaves | no - unless it has a special structure to pump water in or out. water simply diffuses through the process of osmosis. the cell does not have control over this. |
| passive transport | movement of materials through a cell membrane without using energy |
| Is the process of osmosis an example of active transport or passive transport? | passive transport |
| Is the process of diffusion an example of active transport or passive transport? | passive transport |
| active transport | movement of materials through a cell membrane using energy - from low concentration to high concentration (opposite of passive transport) |
| which process - active or passive transport - requires energy? | active transport |
| Which process, active or passive transport, moves molecules from an area of LOW concentration to HIGH concentration | active transport |
| which process, active or passive transport, move molecules from an area of HIGH concentration to LOW concentration? | passive transport |
Created by:
camponel
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