Question

Cell wall is made up of
A. Several layers of microfibrils
B.Several micellar
C. Cellulose molecules
D. None of the above

Answer 1

Hint: Cell is the unit of life. In-plant cells the covering of cells is the cell wall, but in the case of animals there is no cell wall present, so this is the main difference between plant cell and animal cell. It is called the plasma membrane in case of an animal cell. So this cell is generally made-up of some proteinaceous molecule.

Complete answer:
CELL WALL
A non-living rigid structure called the cell wall forms an outer covering for the plasma membrane of bacteria, some protist, Fungi, Algae and Plants. Algae have a cell wall, made of cellulose, galactans. mannans and minerals like calcium carbonate. ln other plants cell wall consists of cellulose, hemicellulose, pectins and proteins. Middle lamella is consist of Ca & Mg pectates (Plant cement). Amount of Ca is more.
Cellulose is the main constituent of cell wall but an addition to cellulose-Hemicellulose, Cutin, Pectin, Lignin, Suberin are also present in the cell wall. Cell wall worked as a frame or protective layer of the cell. (Exoskeleton of the cell). Cellulose microfibrils and microfibrils are arranged in layers to form the skeleton of the cell wall.
In between these layers other substances like pectin, hemicellulose may be present. These form the matrix of the cell wall. Cell wall materials (Hemicellulose Pectin, lignin) are synthesized in plant Golgi bodies or dictyosomes. Formation of cellulose occurs by the cell membrane.

So C is the correct option.

Note: In a plant cell, the cell was generally made-up of the most important protein that is cellulose molecule which is the polysaccharide also. Cellulose is also a fibre, so it is abundantly present in the surface of leaves. The protein is present in a bilayer manner in the cell surface of the cell wall. All these are absent in the animal cell.