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MEMBRANE TRANSPORT 2 (types of transporter (active transport (use variety…

- - - - uniport - one solute at a time
      - symport - two solutes in same direction at same time
      - antiport - two solutes in opposite directions
  - - - continually transports glucose into cells at an essentially constant rate
- - - - proteins
      - carbohydrates
      - nucleic acids
    - - mass > 1,000 Da (sometimes > 1,000,000 Da)
  - - - cell engulfs fluid containing molecules
      - material enters cell inside vesicle then fuses with an endosome and a lysosome and is degraded
    - - allows uptake of specific macromolecules
      - ligands bind to receptors
    - - cell engulfs a sizable object e.g. cell debris / bacteria
      - occurs in specialist cells e.g. macrophage (WBC which engulfs bacteria, cancer cells etc)
- - - - binding of one molecule facilitates the binding of the other
      - both glucose and sodium bind to the pump
    - - same mechanism used for various sugars and amino acids