Each year Colorado Counties are required to submit to the Division of Property Taxation, the Property Tax Administrator, the State Board of Equalization and the County Board of Equalization (the Board of County Commissioners) an Abstract of Assessment.
Nageli and Cramer in 1855 had already suggested that biological cells are separated from their environment by a membrane possessing special characteristics, and in 1900 Overton performed some simple but classical experiments which proposed that cell membranes were composed of lipids (1).
Rating Newest Oldest. Best Answer: The cell membrane is made up mostly of molecules called phospholipids. Lipids, as you may know, are any organic molecule that won't mix with water. Cooking oil, for example, is made up of lipids. Lipids are used in the cell membrane precisely because they won't mix with water, meaning they form an effective barrier between the water solution inside the cell and the environment outside.