Structure and function:

Triacylglycerols  which is also  called  triglycerides or fats  consist  of  three  fatty  acid chains  esterified  to  a  glycerol  backbone.  Easy  triacylglycerols   have  three identical fatty acids esterified to the glycerol backbone, although mixed triacylglycerols  have  two  or  three  variant  fatty  acid  chains that is shown in figure.  Triacylglycerols constitute the main fuel store and the main dietary lipid in humans. Triacylglycerols are a widely concentrated energy store. The energy acquiesce from the complete oxidation of fatty acids is about 39 kJ g^-1, contrast with an energy yield of 13 kJ g^-1 of carbohydrate or protein. The hydrophobic belongings of fats

Figure:  Structure of (a) a simple triacylglycerol (1,2,3-tripalmitoyl-glycerol)  and (b) a mixed triacylglycerol (1-palmitoyl-2,3-dioleoyl-glycerol).

make  them  insoluble  in  water, fats  are  stored  in  specialized  cells  known as adipose  cells (fat cells),  that  consist  almost  fully  of triacylglycerol.  This cell is specialized for the synthesis and storage of triacylglycerols and for their mobilization   into fuel molecules.  The Triacylglycerols   are transported   round the body in huge lipid-protein particles known as lipoproteins.