The mole is a unit of measurement that denotes an amount of substance (also called chemical amount). The mole is defined as the number of atoms found in exactly 0.012 kilogram (or 12 grams) of carbon-12, where the carbon-12 atoms are unbound, at rest and in their ground state.
Plasma Membrane Definition. Plasma membrane can be defined as a biological membrane or an outer membrane of a cell, which is composed of two layers of phospholipids and embedded with proteins. It is a thin semi permeable membrane layer, which surrounds the cytoplasm and other constituents of the cell.
The plasma membrane is essentially a barrier that separates the interior of the cells from the outside environment. Plasma membrane is also known as a cell membrane. Plasma membranes are present in all kinds of cells, including both animal and plant cells.he main function of a cell membrane is to regulate what enters and exits the cell. The cell membrane also gives a loose shape to the cell and ensures that parts of the cell do not flow away from the cell. The cell membrane consists of a thin layer of amphipathic phospholipids.