I'm learning about chemical evolution and the transition from RNA to protocells to cells. I understand that the protocells have a phospholipid structure called a liposome.

I recently saw a video showing CG animations of the workings of a cell and it seemed that the cell wall was much more complex than what it seems a liposome is.

I'm looking for information about the differences between a liposome and a basic cell wall (not sure of the difference for different types of cells - but I guess for prokaryote since that would have been first.)


1 Answer 1


By looking on wikipedia I found:

About liposome

A liposome is a spherical vesicle having at least one lipid bilayer. The liposome can be used as a vehicle for administration of nutrients and pharmaceutical drugs. Liposomes can be prepared by disrupting biological membranes (such as by sonication).

Liposomes are most often composed of phospholipids, especially phosphatidylcholine, but may also include other lipids, such as egg phosphatidylethanolamine, so long as they are compatible with lipid bilayer structure. A liposome design may employ surface ligands for attaching to unhealthy tissue.

About cell membrane

The cell membrane (also known as the plasma membrane or cytoplasmic membrane) is a biological membrane that separates the interior of all cells from the outside environment.The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells. The basic function of the cell membrane is to protect the cell from its surroundings.

It consists of the lipid bilayer with embedded proteins. Cell membranes are involved in a variety of cellular processes such as cell adhesion, ion conductivity and cell signalling and serve as the attachment surface for several extracellular structures, including the cell wall, glycocalyx, and intracellular cytoskeleton. Cell membranes can be artificially reassembled.

So the major difference seems to be the presence of "embedded proteins" inside the cell membrane.


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