This causes the molecule to bend or kink at each of the double bond sites. These molecules are found making up the plasma membrane of cells. They exhibit a polar and nonpolar quality. The phosphate group is hydrophilic while the fatty acid area is hydrophobic. Lipids characterized by a carbon skeleton of 4 fused rings.
Cholesterol is an important steroid found in all animal tissue.
Plants do not contain cholesterol. It also adds strength to the plasma membrane in animal cells. E, IgA,and Ig. Most amino acids consist of an asymmetrical carbon bonded to an, amino group, hydrogen, an R group,and a carboxyl group. There are 20 different amino acids.