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The Plasma Membrane - Coggle Diagram
The Plasma Membrane
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Fluid Mosaic Model
Fluid Component
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Cholesterol: Maintains membrane fluidity in cooler temperatures, preventing the membrane from crystallising. Maintains membrane stability in hotter temperatures preventing the membrane from rupturing.
Allows hydrophobic molecules to pass through the plasma membrane via. simple diffusion and small polar/ hydrophilic molecules such as water and ethanol.
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Mosaic component
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Transport proteins
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Channel Proteins
Features
Open on both sides, transport ions and water
Function
Is only able to perform facilitated diffusion, form aqueous pores each allowing a specific solute to pass through the plasma membrane
Carrier proteins
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Functions
Is able to perform active transport and facilitated diffusion, transport large molecules such as amino acids, nucleotides and sugars, bind to solute and undergo a 3D conformational change o transport the solute across the plasma membrane
Protein Export
Organelles
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Golgi Apparatus
Store, modify, package and export cell products
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Nucleus
Store DNA in the form of chromosomes, which therefore controls all cell activities.
Processes
mRNA molecules move to the Rough endoplasmic reticulum and bind to bound ribosomes where a protein chain is synthesised
Unfinished protein is packaged into transport vesicles which are then carried to the Golgi apparatus
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Exocytotic/ golgi vesicles transport the finished protein to the surface of the plasma membrane or to the extracellular fluid via exocytosis