Which of the following minerals is a major component of biological membranes?: (A) Potassium, (B) Sodium, (C) Calcium, (D) Phosphorus
Answer is D. Lipid bilayer is made up of phospholipids - Lecithin, Sphingomyelin, Phosphatidyl Inositol and Phosphatidyl serine. So, phosphorus is a major component of biological membranes.