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The Cell Membrane (Plasma Membranes (Compounds (Phospholipids (amphipathic…

- - - - Bilayer used in cell mem. - gylcolipid ( has no sugar molec.)
      - Cholesterol = lipid, C27H46O
        
        imp. keeping mem. stable at normal body temp.
        
        V. imp. in controlling membrane fluidity, more cholesterol = less fluid + less permeable
        
        Present in all cell mem. (exept bacteria cell)
        
        molec. fit b/w phospholipid forcing it to pack closer t/g - lessens movement of p.lipids making mem. less fluid and more rigid
    - - Proteins span whole width of the mem
- - - - On surface or partially embedded give mechanical support / act as cell receptors
    - - Span bilayer sheets from one side to other. some involved in transport of water-soluble materials across the mem. ( carrier proteins)