The plasma membrane is a biological membrane present in both eukaryotic and prokaryotic cells. It is also called the cell membrane because it works as a barrier between the inner and outer surfaces of the cell. In animal cells, the plasma membrane is present in the outer most layers of the cell, and in a plant cell it is present directly under the cell wall.
The plasma membrane can be defined as the biological membrane, or the outer membrane of a cell, which consists of two layers of phospholipids and is embedded by proteins. It is a thin, semi-permeable membrane layer that surrounds the cytoplasm and other cell constituents.
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