fat cell

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    • #1954
      paperclip
      Participant

      i know the bits and pieces that go to form the lipid bilayer of a cell membrane. But what is the names of the bits and pieces ?of the bilayer? that keeps the cell membrane from dissolving into a heap of goo within and without? Cn’t be phosphate and metal cations only.

    • #29837
      baikuza
      Participant

      u’r talking about organic compounds, are u?

      …are there any organel that consist of metal as the element?

      try this
      http://blanco.biomol.uci.edu/Bilayer_Struc.html
      http://users.rcn.com/jkimball.ma.ultran … ranes.html
      http://www.answers.com/topic/lipid-bilayer
      or this one, actually it’s same as up here
      http://psychcentral.com/psypsych/Lipid_bilayer

    • #29850
      paperclip
      Participant

      Erm how about Na+ and K+ in transit between the bilayer?

    • #29872
      victor
      Participant

      I think they use an antiport fascilitated diffusion system by reffering to the concentration gradient inside and outside the cell itself..

    • #29892
      MrMistery
      Participant

      The integrity of the cellular membrane and it’s structure is a very complicated thing, impossible to answer here. Alberts has 200 pages on this…

    • #30255
      baikuza
      Participant

      yeah!
      Mr. Mistery is right.
      beside Na+ and K + there are more activities at membrane cell.
      try book(s) about prokaryotic cell.
      all metabolism activites take place at its membrane.
      just like what i got in my lecture

      __________
      awake on the day
      knowing u are talking together,
      i just wanna to join the fun

    • #30285
      paperclip
      Participant

      That’s not fair! If all metabolism takes place at the cell membrane than why is the cytosol not all membranes and no conduits?

    • #30297
      baikuza
      Participant

      oh.. sorry
      very sorry..
      ok, I will said that ‘”Almost of the processes of metabolism in prokaryotic cell take place in its membrane cell, not in membrane which belong to organelle because it do not have any organelle.”

      men always have weakness. uh..am i must said this. but i’m so sorry. 😳
      _______
      no body is perfect.

    • #30328
      MrMistery
      Participant

      Also take note that even in an abiotic hidrophilic environment lipids form mycels and then break up and form bilayers…

    • #30706
      paperclip
      Participant

      Can you also explain why oils float on water? I guess waxes can float too.

    • #30709
      Poison
      Participant

      Density. Water’s density > Oil’s density

    • #30712
      paperclip
      Participant

      Can it get more fundamental? How does density affect floatation?

    • #30713
      baikuza
      Participant

      have you heard about hidrophobic and hidrophilic as the properties of compounds?

      lipid (e.g. oil, fat) are hidrophobic. so that it float to water.

      am i right, moderator?

    • #30722
      Poison
      Participant

      If you put a stone in water it will sink. Right? Means Stone’s density > water’s density.

      And about the hydrophilic compounds: Hydrophilic side is turned to the water and hydrophobic side is turned to each other. If I shold give an example from cell membrane- as it is easy to draw here- ( you know, it is made of two lipid bilayers)

      O: hydrophilic head
      ll : hydrophobic tails

      Outside the cell

      OOOOOOOOOO
      ll ll ll ll ll ll ll ll ll ll
      ll ll ll ll ll ll ll ll ll ll
      OOOOOOOOOO

      Inside the cell

    • #30724
      victor
      Participant
      quote paperclip:

      Can you also explain why oils float on water? I guess waxes can float too.

      a little bit correction my friends, lets see:
      water consist of 2 H atom and one O atom forming H2O with a tetrahedron geometry molecule. There are still some free electron pairs that makes H2O become polar molecules that only can soluble other polar molecules.
      While fats are the unpolar one so, fats don’t soluble in the water.
      The floating thing can be explained by the presence of Hydrogen bond in the water..it’s the same like a cube of ice float in the water. ice has a bigger density than water but water has more freely hydrogen bond compared to ice cube…
      For more information, read your organic chemistry book… 😀

    • #30748
      Poison
      Participant
      quote victor:

      ice has a bigger density than water

      No. density of ice is less than density of water. Think that ice expands when it freezes.

    • #30767
      victor
      Participant

      Oops…sorry, got it upside down… 😳

    • #30770
      Mjhavok
      Participant
      quote paperclip:

      i know the bits and pieces that go to form the lipid bilayer of a cell membrane. But what is the names of the bits and pieces ?of the bilayer? that keeps the cell membrane from dissolving into a heap of goo within and without? Cn’t be phosphate and metal cations only.

      Bits and pieces of the bilayer? Do you mean phospholipids, sphingolipids, glycoproteins, glycolipids, cholesterol etc.

    • #30773
      victor
      Participant

      Seems to be likely…because the bits at the bilayer are integrins, proteoglycane, glicoprotein, etc….

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