September 22, 2005 at 10:16 am #1954
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.
September 22, 2005 at 11:56 am #29837
u’r talking about organic compounds, are u?
…are there any organel that consist of metal as the element?
http://users.rcn.com/jkimball.ma.ultran … ranes.html
or this one, actually it’s same as up here
September 22, 2005 at 3:33 pm #29850
Erm how about Na+ and K+ in transit between the bilayer?
September 23, 2005 at 12:15 pm #29872
I think they use an antiport fascilitated diffusion system by reffering to the concentration gradient inside and outside the cell itself..
September 23, 2005 at 8:14 pm #29892MrMisteryParticipant
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…
October 2, 2005 at 1:24 am #30255
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
October 3, 2005 at 4:23 am #30285
That’s not fair! If all metabolism takes place at the cell membrane than why is the cytosol not all membranes and no conduits?
October 3, 2005 at 11:48 am #30297
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.
October 3, 2005 at 6:15 pm #30328MrMisteryParticipant
Also take note that even in an abiotic hidrophilic environment lipids form mycels and then break up and form bilayers…
October 10, 2005 at 4:45 am #30706
Can you also explain why oils float on water? I guess waxes can float too.
October 10, 2005 at 5:58 am #30709
Density. Water’s density > Oil’s density
October 10, 2005 at 7:25 am #30712
Can it get more fundamental? How does density affect floatation?
October 10, 2005 at 9:28 am #30713
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?
October 10, 2005 at 12:09 pm #30722
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
ll ll ll ll ll ll ll ll ll ll
ll ll ll ll ll ll ll ll ll ll
Inside the cell
October 10, 2005 at 12:33 pm #30724quote paperclip:
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… 😀
October 10, 2005 at 7:33 pm #30748quote victor:
No. density of ice is less than density of water. Think that ice expands when it freezes.
October 11, 2005 at 11:23 am #30767
Oops…sorry, got it upside down… 😳
October 11, 2005 at 11:29 am #30770MjhavokParticipantquote paperclip:
Bits and pieces of the bilayer? Do you mean phospholipids, sphingolipids, glycoproteins, glycolipids, cholesterol etc.
October 11, 2005 at 12:22 pm #30773
Seems to be likely…because the bits at the bilayer are integrins, proteoglycane, glicoprotein, etc….
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