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14 Cards in this Set
- Front
- Back
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The Membrane is regarded as?
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Semi Permeable
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The plasma membrane consists of a bilayer
-The two fatty acid tails are -The (-) charge in phosphate heads makes them |
The living plasma membrane is a liquid material made of a special kind of lipid molecule, phospholipid.
Phospholipids only have two fatty acid ‘tails’ that are non-polar (hydrophobic) The head end, because of (-) charge in the phosphate group, is polar (hydrophilic) The Lipid bilayer |
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The Fluid Mosaic Model of the Plasma Membrane
-What do perphiral proteins act as, what are they attached to -What do integral proteins act as -What do glycocalyx act as |
Perphiral proteins
-Act as anchors, connected to the cytoskeleton, lie on inner or outer surface -Structural Support Integral Proteins -Extend through entire membrane -Allow molecules to pass or not to pass -Cell-to-cell-recognition (Glycoproteins) Glycocalyx -Part carb, part protein -Serve as a place for molecules to bind -Cell to Cell communication |
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The Fluid Mosaic of Plasma Membrane
-Cholesterols |
-Cholesterol Subunits
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Law of Diffusion(Law of Entropy)
-Particles from ______ to ______ -Particles follow the _____ gradient |
-Particles move from areas of high concen to low concen
-Particles follow the concentration(diffusion) gradient |
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Simple Diffusion
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-Small and uncharged molecules and water can pass freely through membrane
-Expends no energy |
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Faciliated Diffusion
-What kind of molecules does this permit for -How much energy does it use -The molecule is following the _________ -Passive |
-Large molecules use special proteins, or integral proteins to pass
-The molecule is following the diffusion gradient, so it expends little energy |
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Active transport (diffusion)
-How much energy does it use -What is being pumped |
-Ions(charged particles) can be pumped
-The molecules are moving against the gradient, so this uses much energy -Defys law of thermodynaics |
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Osmosis
-A special type of _____ across a semi permeable membrane -Water always follow ____ |
-Diffusion
-Osmosis is defined as the diffusion of solvent, across a semi-permeable membrane -Water always follow solute |
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Osmotic Balance
(Hypertonic surrounding) -What is crenation -What is the concentration of solute |
-The cell is experiencing crenation, water is leaving
-High concentration of solute |
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Osmotic Balance
(Hypotonic Solution) -Who prefers this |
-Plant cells prefer this
-Low concentration of solute |
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Osmotic Balance
(Isotonic surroundings) -Who prefers this, ____ Balance |
-Animal cells prefer this
-Osmotic Balance -equal concentrations of solute |
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Moving lots of stuff out of the membrane
Exocytosis |
-Uses a transport vesicle to move molecules out of cell
-Smaller molecules |
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Endocytosis
-What are the three types of endocytosis |
-Using a transport vesicle to import into cell
Three Types Pinocytosis : The cell gulps water by forming a vesicle around it Phagocytosis - Cell shoots a web at a particle and packages it into a food vacuole Receptor mediated endocytosis - Special recepter proteins that transport certain molecules in the cell |
