<prompt> Reverse cholesterol transport is done by:VLDLLDLHDLChylomicrons  <response>: Ans. c HDL. Ref. Harper, Biochemistry, 25thpg.270LIPOPROTEINFUNCTIONSChylomicron- Delivers dietary triglycerides to peripheral tissues and dietary cholesterol to liver.- Secreted by intestinal epithelial cells.- Levels are classically increased in lipoprotein lipase deficiency.0- Excess causes pancreatitis, lipemia retinalis, and eruptive xanthomas.VLDL- Delivers hepatic triglycerides to peripheral tissues.- Secreted by liver.- Excess causes pancreatitis.LDL- Delivers hepatic cholesterol to peripheral tissues.- Formed by lipoprotein lipase modification of VLDL in the peripheral tissue.- Taken up by target cells via receptor-mediated endocytosis.- Classically increased in familial hypercholesterolemia.- Most atherogenic.0HDL- So called good cholesterolanti-atherogenic.- Mediates centripetal transport of cholesterol reverse cholesterol transport.- Acts as a precursor for apoC and apoE which are needed for chylomicron and VLDL metabolism.- Secreted from both liver and intestine. Lowest density lipoprotein with largest size Chylomicrons. Highest cholesterol containing lipoprotein 50 LDL. Least cholesterol containing lipoprotein 5 Chylomicrons. Highest triacyglycerol containing lipoprotein Chylomicromins. Highest protein containing lipoprotein HDL 2 albumin FFA 1. Least protein containing lipoprotein Chylomicrons. Least triacyl glycerol containing lipoprotein 3 HDL. Highest phospholipid containing lipoprotein HDL. Exogeous lipid transport from intestine to liver extrahepatic tissues through Chylomicrons. Endogeous lipid transport is from liver to extrahepatic tissues via VLDL. Reverse cholesterol transport is from extrahepatic tissues to liver via HDL. Essential fatty acids are arachidonic acid. Linoleic acid, lenolenic acid Fatty acid chain with ?1 double bonds are unsaturated fatty acids, e.g., linoleic acid--18:2, lenolenic acid--18:3, arachidonic acid--20:4.e Oleic acid, 