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18 Cards in this Set
- Front
- Back
The working cell |
Dead cell |
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Fluid Mosaic Model |
Theory that explains the structure of membrane |
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How many membrane proteins? |
6 |
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Enzymes |
Some membrane proteins are enzymes. Enzymes maybe group to carry out sequential reaction. |
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Transporters(active and channel) |
Allow specific ions or molecules to enter or exit the cell |
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Receptors |
Signaling molecules bind yo receptor proteins. Receptors proteins relay the message by activating other molecules inside the cell. |
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Attachment protein |
Attach to the extracellular matrix and cytoskeleton. Help support the membrane and can coordinate external/internal changes |
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Junction protein |
Form intercelluar junctions that attach adjacent cells |
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Gycoproteins |
Serve as ID tags. Maybe recognized by membrane proteins of other cells. |
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Membrane function |
Membrane structure gives it certain properties. Properties effect how things move in and out of cell. Lipid bi layer makes the membrane selectively permeable( selectivity what goes in/out) |
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Lipid Bi Layer |
Hydrophillic heads are in contact with the cytoplasm. |
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Selective Permeability (what can pass through) |
1. Small, non polar molecules like oxygen and carbon dioxide.
2. Water can slip through because it is small and relatively uncharged |
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Selective Permeability (what cant pass through) |
Big molecules like sugar, proteins and charge molecules(H+. Cl-) They cant go through the hydrophobic region of the bi layer. |
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Transports( How do molecules and ions move in and out of cells?) |
Depends on the molecule and other factors. Some molecules can simply diffuse in and out. This is one form called passive transport( NO ATP)
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Diffusion |
movement of molecules from a area of higer concentration to an area of low concentration. Dependent upon concentration
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Concentration |
Number of molecules in a specific area
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Concentration Gradient |
When the number of solute molecules in one side is different than the other side
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Equilibrium |
no concentration gradient exist. Solute molecules move down concentration gradient until equilibrium is reached. |