Cell wall is present only in plants and in some fungi, bacteria, algae and cell membrane is present in all types of cells, in humans, animals, plants, bacteria, etc. The cell wall is the outermost part of the plant cell and the cell membrane is the outermost covering the animal cells. The cell wall is made up of pectin, chitin, lignin, glycoproteins, glycolipids, sugar, and cellulose and the cell membrane is a lipid bilayer and is composed of lipoproteins and carbohydrates. The cell wall is 0.1 μm to several μm in thickness and the cell membrane is 7.5–10 nm in thickness. The cell wall is a thick and rigid structure with a fixed shape and the cell membrane is a thin and delicate structure and also is flexible to change the shape as needed.