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 cytoplasm and other prokaryotic cellular contents are found inside the plasma membrane. On the other hand, all eukaryotic cells have a plasma membrane as well, but they also have additional phospholipid membranes surrounding internal structures like the nucleus, the mitochondria, and the chloroplasts.n addition to phospholipids, the plasma membrane has cholesterol molecules and proteins that allow the membrane to function properly. Cholesterol molecules are primarily responsible for giving the membrane the rigidity it needs to hold the cellâs shape.