Lipids may be broadly defined as hydrophobic or amphiphilic small molecules. In most
membranes, approximately 40%-50% of the mass of the membrane is composed of lipids. Lipidsprovide a matrix for protein groups, acts as a barrier for ions & molecules and have the samestructure in all membranes. Lipids are a diverse group of large biological molecules that do notinclude polymers and is made up primarily or exclusively of non-polar groups. They are grouped
together and have little or no affinity for water. Due to their non-polar character, lipids typicallydissolve more readily in non-polar solvents such as acetone, ether, and benzene etc. This
solubility characteristic is of extreme importance in cells because lipids act as barriers and form