Triacylglycerols biological functions

Triacylglycerols and the ether lipids described in the previous section are classified as neutral lipids. Other neutral lipids are alcohols, waxes, aldehydes, and hydrocarbons derived from fatty acids. These sometimes have specific biological functions. For example, fatty aldehydes are important in the bioluminescence of bacteria (Eq. 23-47). 

List the primary biological functions of triacylglycerols and phospholipids. 

Trace amounts of many other proteins are recovered in purified fractions of plasma lipoproteins. Some, like albumin, have plausible functions both at the lipoprotein surface [binding unesterified fatty acids newly generated from lipoprotein triacylglycerol (TG)] and in free solution to ensure osmotic balance between cells and their surroundings. Blood-clotting proteins are present in low amounts in TG-rich lipoproteins, but it is not clear that they play a unique biological role in lipoproteins. Many lipoprotein-associated proteins have no known function in lipid transport. 

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