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unit 5 Membrane structure, synthesis, and transport - Coggle Diagram
unit 5 Membrane structure, synthesis, and transport
membrane structure
fluid mosaic model
proteins
integral (intrinsic)
peripheral (extrinsic)
phospholipid bilayer
membrane transport
Active transport (against gradient)
primary (directly uses energy)
secondary (uses a preexisting gradient
passive transport
gradients
transmembrane gradient
ion electrochemical gradient
osmosis
plants: turgid - flaccid - plasmolysed
freshwater protists have contractile vacuoles to control water pressure
animals: crenation - normal - lysis
hydrophobic barrier of phospholipids
tonicity
isotonic
hypertonic
hypotonic
transport proteins
channels (open passageways)
transporters (conformational changes)
symporter (cotransporter)
antiporter
uniporter
transport in bulk
exocytosis (cargo leaves cell using vesicles)
endocytosis (cargo enters cell using vesicles)
synthesis of membrane component
transfer of lipids
transported via vesicles
lipid exchange proteins (like flippase)
diffusion laterally
protein synthesis (cotranslational
synthesis is halted and directed to the rough ER
proteins are synthesized into ER membrane
transported via vessicles
lipid synthesis
occurs in cytosolic leaflet of smooth ER
fatty acids absorbed by body turned into phospholipids using membrane proteins
glycosylation: glycoprotein/ glycolipid
membrane fluidity
semifluid
lateral movement
flip flop action using flippase and ATP
lipid rafts
high cholesterol and unique proteins
factors
presence of double bonds
cholesterol (stabalizes membrane)
fatty acyl tail length