A lipoprotein membrane which encloses many cells and cell organelles and is composed of two electron-dense layers enclosing a less dense layer.
- A cholesterol-containing unit membrane defines the cell body; however, there is no periplasm providing rigidity for the cell.
- The ER is made up of two unit membranes enclosing a lumen in between.
- The inner membrane composition is phospholipid with many integral proteins (as in bacterial unit membranes)
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