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).
The plasma membrane (cell membrane) is made of two layers of phospholipids. The plasma membrane has many proteins embedded in it. The plasma membrane regulates the entry and exit of the cell. Many molecules cross the cell membrane by diffusion and osmosis. The fundamental structure of the membrane is phospho lipid bilayer and it forms a stable barrier between two aqueous compartments.