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The cell membrane is the limiting element in a cell within which the different cell elements or organelles exist. It is a semi-permeable membrane and has its own functions with relation to the different activities that happen inside the cell. Besides forming the protective layer within which different cell organelles exist, the cell membrane also performs the function of transporting different substances such as amino acids, sugars, as well as other ions into and out of the cell. The cell membrane is also called the plasma membrane, and is made up of different compounds. While the cell membrane is a semi permeable membrane, there is another layer outside it, a rigid layer that is the final outer wall of the cell, called the cell wall.
The cell membrane is primarily made up of lipids, which are fat bodies, as well as proteins. These are present as two layers, and are found in equal proportion throughout the cell membrane. These are the organic compounds, long chain hydrocarbons, which are found in the cell membrane.
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