Which of the following chemical components are involved as structural components in building up of plasma membrane?

Chemically, a biomembrane consists of lipids (20-79%), proteins (20-70%), carbohydrates (1-5%) and water (20%). Ratio of protein and lipids varies in different membranes. The important lipids of the membrane are phospholipids (some hundred types), sterols, (e.g., cholesterol), glycolipids, sphingolipid (e.g., sphingomyelin, cerebrosides). Protein can be fibrous or globular. It is structural, carrier, receptor or enzymatic proteins.