Camponeschi - Cells target 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| selectively permeable | some substances can pass through while others cannot
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| What are the three methods substances can move in and out of a cell? | diffusion, osmosis, and active transport
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| diffusion | process by which molecules tend to move from an area of higher concentration to an area of lower concentration (HIGH TO LOW)
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| 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.
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| 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)
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| osmosis | diffusion of water through a selectively permeable membrane
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| How is osmosis related to diffusion? | osmosis is an example of diffusion - it is diffusion of water across a membrane
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| 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)
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| 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)
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| 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.
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| passive transport | movement of materials through a cell membrane without using energy
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| Is the process of osmosis an example of active transport or passive transport? | passive transport
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| Is the process of diffusion an example of active transport or passive transport? | passive transport
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| active transport | movement of materials through a cell membrane using energy - from low concentration to high concentration (opposite of passive transport)
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| which process - active or passive transport - requires energy? | active transport
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| Which process, active or passive transport, moves molecules from an area of LOW concentration to HIGH concentration | active transport
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| which process, active or passive transport, move molecules from an area of HIGH concentration to LOW concentration? | passive transport
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