What is the main component of the cell membrane? 

The main component of the cell membrane is lipids. The cell membrane, also known as the plasma membrane, is primarily composed of a bilayer of phospholipid molecules. The phospholipid bilayer provides a barrier that separates the internal environment of the cell from its external environment, while also allowing certain substances to pass through. In addition to phospholipids, the cell membrane also contains other types of lipids such as cholesterol and glycolipids. Proteins and carbohydrates are also present in the cell membrane, but lipids are the main component.