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 the membrane surrounding a cell that separates the cell from its external environment - responsible for barrier function; consists of a phospholipid bilayer (polar head group, nonpolar tails) and associated membrane lipids and proteins (integral-help transport hydrophilic molecules across bilayer, peripheral, and ...