Question

The plasma membrane contains all, except

A) phospholipids
B) proteins
C) cellulose
D) cholesterol

Answer 1

The plasma membrane is primarily composed of phospholipids and proteins. It also contains cholesterol, carbohydrates, glycolipids, and glycoproteins. Cellulose is not found in the plasma membrane.

Step-by-step explanation:

The plasma membrane is made up primarily of a bilayer of phospholipids with embedded proteins, carbohydrates, glycolipids, and glycoproteins, and, in animal cells, cholesterol. Cholesterol helps the plasma membrane keep its shape and regulates the fluidity of the membrane. Carbohydrates are present on the outside surface of the membrane and are attached to proteins or lipids. Cellulose is not found in the plasma membrane.

Answer 2

The plasma membrane contains all, except C) cellulose.

Step-by-step explanation:

The plasma membrane is composed primarily of phospholipids, proteins, and cholesterol. These components are essential for the membrane's structure and function.

Phospholipids: Form the bilayer structure of the membrane, providing a barrier between the inside and outside of the cell.

Proteins: Serve diverse functions, including transport of molecules, cell signaling, and adhesion.

Cholesterol: Stabilizes the membrane structure and affects its fluidity.

Cellulose is a polysaccharide not found in the plasma membrane. It is the main component of plant cell walls and provides structural support.

Therefore, while phospholipids, proteins, and cholesterol are integral components of the plasma membrane, cellulose is not present.

Option C is answer.