Answer: Apolipoproteins (apoproteins) are proteins that bind lipids (oil-soluble substances such as fat and cholesterol) to form lipoproteins. Apolipoproteins, on the surface of lipoproteins help to solubilize the lipids and target the lipoproteins to the correct tissue through the lymphatic and circulatory systems. The lipid components (triacylglycerols and cholesterol esters) of lipoproteins are insoluble in water. However, because of amphipathic (detergent-like) properties of apolipoproteins and phospholipids, they can coat the lipids (as core), resulting to form the lipoprotein particle as water-soluble, and thus can be transport through water-based circulation (i.e., blood, lymph). The purpose of apolipoproteins are: Example: The apolipoproteins are used to evaluate the blood lipid value as: Solution Answer: Apolipoproteins (apoproteins) are proteins that bind lipids (oil-soluble substances such as fat and cholesterol) to form lipoproteins. Apolipoproteins, on the surface of lipoproteins help to solubilize the lipids and target the lipoproteins to the correct tissue through the lymphatic and circulatory systems. The lipid components (triacylglycerols and cholesterol esters) of lipoproteins are insoluble in water. However, because of amphipathic (detergent-like) properties of apolipoproteins and phospholipids, they can coat the lipids (as core), resulting to form the lipoprotein particle as water-soluble, and thus can be transport through water-based circulation (i.e., blood, lymph). The purpose of apolipoproteins are: Example: The apolipoproteins are used to evaluate the blood lipid value as:.