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Membrane Structure and Function (Cell Membrane (Delineate cell, Separate…
Membrane Structure and Function
Cell Membrane
Delineate cell
Separate cell from its environment
Limits size
Exhibit selective permeability
Cell Membrane Organization
Sandwich (proteins outside) or Fluid Mosaic (proteins inside)
Proteins,Carbohydrates, Fibers, Glycolipid, Glycoproteins, etc.
Cells have Sidedness (INSERT DIAGRAM)
Structure
phospholipid bilayer:amphipathic
Movement of phospholipid bilayer: allows for non rigid, lateral movement(frequent)-side to side. Flip-flop, though rare
Factors that Affect Membrane: hydrocarbon tails, temperature
Hydrocarbon tails, if unsaturated will cause kinks (fluid), if saturated there will be viscous (needs to be a mixture of unsaturated and saturated tails)
Cholesterol: Warm temperature reduces fluidity and cool temperature maintains fluidity
Transport across the Membrane(INSERT DIAGRAM)
Membranes are selectively permeable
Passive Transport: Diffusion:Net movement of molecules down a concentration gradient
Solutes diffuse down their own concentration gradient
Osmosis: passive transport of water across the semi-permeable membrane High [Solute], Low [H2O] and vise versa
Hypertonic: low water, high solute (think of hyper solute, a lot of solute)
Hypotonic: low solute, high water (think of O, its bloated with water - Plant cell, turgid
Isotonic: equal solute, equal water -animal cells
Osmoregulation
Facilitated Diffusion: Still moving down concentration gradient with the help of proteins
Similar to enzymes: specific binding sites for solute, can become saturated, can be inhibited, catalyze a physical process
Channel/Corridors
Gate/ Ungated
Carrier Proteins (translocators)
Active Transport: movement of solutes AGAINST a concentration gradient (less to more), requires Energy/ ATP
Transport of Large Molecules
Exocytosis/Endocytosis: Uses Vesicles
Endocytosis:phagocytosis (eating) ,pinocytosis (sipping), receptor-mediated endocytosis (receptors binding in endocytosis (enrichment), recycle materials
What would increase the rate of sucrose transport into the cell: decreasing extracellular pH