Biology unit 1 - Cell Membranes

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  • Biology Unit 1
    • Cell Membranes
      • Fluid mosaic
      • Cell Surface Membrane
        • Acts as a barrier to water soluble substances
        • Permeable to small molecules such as H20, CO2 & O2
        • Often extended into microvilli to provide a larger surface area for the absorption of substances by animal cells
        • Permit movement of substances by endocytosis and exocytosis
      • Membranes within the cell
        • Isolate potentially harmful enzymes in lysosomes
        • Can provide a larger surface area for pigments such as chlorophyll involved within photosynthesis
        • Surrounds vesicles that transport molecules between parts of he cell e.g. proteins transporting from rough endoplasmic reticulum to Golgi apparatus
    • Fluid mosaic


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