<prompt> Metabolically the most active of the plasma lipids isPhospholipidsCholesterolTriacylglycerolFree fatty acids  <response>: Free fatty acids Plasma lipids consist of triacylglycerols 16, phospholipids 30, cholesterol 14 and cholesteryl esters 36, and a much smaller fraction of unesterified long chain fatty acids 4. This latter fraction, the free fatty acids FAA, is metabolically the most active of the plasma lipids. 