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21 Cards in this Set
- Front
- Back
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What is the cell membrane? |
controls what goes in and out; provides protection and support |
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What is the lipid bilayer? |
2 layers of lipids with proteins floating in between |
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Carbs attached to proteins for... |
cell identification |
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What are cell walls? |
thick layer of cellulose outside cell membrane |
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What are cell walls found in? |
plants and prokaryotes |
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What is the main function of the cell wall? |
to provide support and protection |
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What is diffusion? |
the movement of particles from an area of high concentration to an area of low concentration |
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Does diffusion require energy? |
no |
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What is osmosis? |
the diffusion of water across the cell membrane |
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What is equilibrium? |
when the concentration of the solute is the same within the system |
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What happens when its isotonic? |
the concentration of solutes is the same inside and outside of the cell |
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What happens when its hypertonic? |
higher concentration of solutes (less water) is on the outside of the cell |
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What happens when its hypotonic? |
higher concentration of solutes (less water) is inside of the cell |
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What is simple diffusion? |
When small uncharged polar or hyperphobic molecules pass directly through the cell membrane |
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Does simple diffusion require energy? |
no |
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What is facilitated diffusion? |
Molecules crossing the cell membrane by passing through a protein channel |
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Does facilitated diffusion require energy? |
no |
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What is active transport? |
the movement of molecules from an area of low concentration to an are of high concentration |
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Does active transport require energy? |
yes (ATP) |
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What is endocytosis? |
the process of taking the material into the cell by the in folding of the cell membrane |
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What is exocytosis? |
the process of releasing material from the cell |
