The three categories of lipids are very different from one another. What quality do they have in common? 1.They all are in biological membranes for cell signaling. 2.They all contain the element phosphorus for production of hormones. 3.They all have a nonpolar hydrophobic section that does not allow them to mix well with water. 4.They all serve as four-ring structured hydrophilic steroids in the body.