A cell has many important parts and structures that help it function properly. One of its most important parts is the plasma membrane. I like to think of the plasma membrane as a stop light at a four-way intersection. Without the brake light, there would be accidents everywhere and this would prevent smooth traffic. The structure of the plasma membrane is very important in keeping the cell alive and working. Another factor of the plasma membrane is that it holds all the organelles of the cell. The membrane also helps the cell maintain a constant chemical balance and can define separate spaces. The plasma membrane is primarily made up of lipids and proteins that are held together by noncovalent interactions. Lipids help play a very useful role by composing a lipid bilayer. The lipid bilayer consists of two layers of amphophilic molecules and their main purpose is to act as a barrier for the cell against water molecules. Both layers are composed of a hydrophilic head and a hydrophobic tail and can form spontaneously. The hydrophilic heads are polar and...