Cell Surface/Plasma Membrane

Roles of membrane and components in fluid mosaic model

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  • Cell Surface Membrane
    • Also known as plasma membrane, and is partially permeable
    • Roles of membrane
      • Separate cell contents from outside environment
      • Separate cell components from cytoplasm
      • Cell recognition and signalling
      • Holding components of some metabolic pathways in place
      • Regulating the transport of minerals into or out of cells
    • Membrane components and functions
      • Cholesterol
        • Stabilise membrane - Maintain fluidity - reduce permeability
      • Glycoprotein
        • Allow communication across membrane - allow charged particles to pass through membrane
      • Channel Protein
        • Allow movement of substance across membrane - Allow larger molecules to pass through
      • Phospholipid Bilayer
        • Act as barrier to charged particles - Select what enters or leaves cell
      • Glycolipid
        • Involved in cell signalling (along with glycoprotein) and help with immune system
    • Performing different role
      • In cells of growing shoots - membrane contains receptors to detect molecules that regulate growth
      • Muscle cell membranes have lots of channels to uptake lots of glucose for muscle contraction
      • Chloroplast membrane contains chlorophyll for photosynthesis
      • White blood cell membrane contain proteins that recognise foreign cells


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