Cultured marble is less expensive and is made from real chips of natural marble embedded in plastic. It's available in sheet form and in standard counter dimensions of 19 and 22 inches deep. Cultured marble comes with or without a wash basin molded into it, for $50 to $80 per running foot, installed.
The Chemistry of Biology: Proteins. Proteins. Proteins are organic compounds that contain the element nitrogen as well as carbon, hydrogen, and oxygen. Proteins are the most diverse group of biologically important substances and are often considered to be the central compound necessary for life.
Proteins form the structural and function of life. The biological function of a protein is due to its conformation, which is defined as the three dimensional arrangement of the atoms of a molecule. Four basic struct ural levels are assigned to proteins: primary, secondary, tertiary and quarternary structures.