low density lipoproteins are "particles" found
in blood that contain cholesterol. Structurally, they are in the shape of
a sphere with the outer boundry being composed of a single layer of phospholipid.
In the core of the sphere is found esterified cholesterol. Inserted into
the phospholipid shell are proteins called apoB proteins.
High density lipoproteins have a composition similar to that of low density lipoproteins with the exception that apoA protein is inserted into the phospholipid shell in high density lipoproteins.
