Summary:
- All cells have a barrier around them that separates them from the environment and from other cells.
- The plasma membrane is made of a double layer of special lipids, known as phospholipids.
- The inside of all cells also contain a jelly-like substance called cytosol.
- Cytosol is composed of water and other molecules, including enzymes that speed up the cell’s chemical reactions.
- Use the resource below to answer the following questions about the plasma membrane and the cell membrane.