Fort Rucker. Fort Rucker is a U.S. Army post located mostly in Dale County, Alabama, United States. It was named for a Civil War officer, Confederate General Edmund Rucker.
The reason that the cell membrane is considered to be 'semi-permeable' is because there are certain materials that can pass through the cell membrane (e.g. hydrocarbons and oxygen cross through the cell membrane as they can be dissolved into the lipid layer-other examples include small polar molecules.he basic structure of the cell membrane consists of layers. The cell membrane is a phospholid bi-layer. It is made up of proteins and lipids (also known as the phospholipid).
Grendel strongly suggested plasma membranes actually consist of lipid bilayers. When they extracted the lipid from plasma membranes of different mammals, they found just enough to make a monolayer with approximately twice the surface area of the cells from which the lipid was obtained. Thus, they concluded the cells were covered with a membrane consisting of a symmetrical lipid bilayer.