mechanisms of membrane transport

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    • #10880

      so a queston on my reveiw sheet asks
      describe the mechanisms of membrane transport.

      my answer: diffusion:passive movement of molecules, high consentate to low consentrate
      osmosis:a low solute cosentration to high solute consentration
      carrier transport: protein with cell membrane
      bulk transport: substense intake

      are my answers correct to the question? i dont understand the question

    • #89066

      they probably want you to describe carrier transport in more detail, including something about conformational changes.

    • #89654

      your answers are correct but for osmosis my teacher said a better way to put it is:
      osmosis: the movement of free water molecules from a region of high free water molecules to a region of low free water molecules.

      endocytosis/exocytosis -movement of large molecule into and out of the cell respectively via invagination (or folding) of the cell membrane. The memebrane forms vesicles around the large molecule.

      active transport- can be in either protein channels or carrier proteins but go from low to high concentration and energy is expended.

      channel proteins-generally transport ions (charged particles) through the cell membrane

      for diffusion there is also lots of ways , you may like to elaborate like describe how lipid soluble molecules would dissolve through the lipid bilayer of the membrane. And how small molecules like urea , water and carbon dioxide sqeeze through the phospholipid heads to travel thorugh

      hope this helps..
      and good luck 🙂

    • #93390

      Good answer but I think it is more looking for like exocytosis how a vacuole move objects in or out in the case of endocytosis

    • #93396

      what about protein translocation?

      Problem: you have a protein one side of a membrane and you want to get it on the other side. How do you do it?

    • #93438

      I liked you example of endocytosis and exocytosis! 😉

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