What is the cell membrane made of? Check all that apply. proteins cellulose carbohydrates lipids

## Step 1<br />The cell membrane, also known as the plasma membrane, is a biological structure that separates the interior of cells from the external environment. It is composed of several components that contribute to its structure and function.<br /><br />## Step 2<br />The first component is proteins. These are integral to the cell membrane as they perform various functions such as acting as enzymes, signaling molecules, and transporters.<br /><br />## Step 3<br />The second component is carbohydrates. These are often attached to proteins (glycoproteins) or lipids (glycolipids) on the cell membrane. They play a role in cell recognition and signaling.<br /><br />## Step 4<br />The third component is lipids. The most common type of lipid in the cell membrane is phospholipids. These form the basic structure of the cell membrane, creating a bilayer that separates the cell from its environment.<br /><br />## Step 5<br />Cellulose, however, is not a component of the cell membrane. It is a complex carbohydrate that is a primary component of the cell walls of plants, not the cell membranes of animals or humans.