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.
4.1. Plasma Membrane Structure and Function. 1  Introduction: plasma membrane is boundary of the cell that regulates the passage of molecules into and out of the cell, similar to a castle wall..1. Plasma Membrane Structure and Function. 1  Introduction: plasma membrane is boundary of the cell that regulates the passage of molecules into and out of the cell, similar to a castle wall.