5 groups by density: c/w water; ie. complex assemblies of ~100 proteins (outer water soluble shell) which transport all lipids (non-water-soluble hydrocarbon molecules; e.g. triglycerides, phospholipids & cholesterol), within each particle, around the body in the water outside all cells. They enable fat transport in H20 & cells to take in (or export) fat molecules for use as either raw materials or to burn for energy.
Answered 5/28/2015
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