What are the cell wall functions?

Answer 1

A cell wall is a tough, flexible and sometimes fairly rigid layer surrounding a cell, located external to the cell membrane, which provides the cell with structural support, protection, and acts as a filtering mechanism. A major function of the cell wall is to act as a pressure vessel, preventing over-expansion when water enters the cell. They are found in plants, bacteria, fungi, algae, and some archaea.

Furthermore it keeps the right environment inside the cell in order for the chemical reactions in the cell to function properly. For example the reaction need to keep the right pH (Proton concentration) as well as other koncentrations (salt, nitrogen et.c.).

Furthermore it helps the cell to control the amounts of different proteins/enzymes inside the cell at any given time, which is very important, because there is a great interplay of different enzymes and it's reactants and products where the amount of one protein regulates the activity of many other proteins and enzymes, so forming a complex "regulatory network", that helps regulate the different functions in the cell, like breaking down food stuffs, reacting to outside signals, replicating DNA e.t.c. e.t.c. All this requires precise control over the amounts of the proteins/enzymes inside the cell.

It is also important to notice that many many of these proteins/enzymes are actually themselves placed in the membrane, having functions like keeping a concentration gradient over the membrane (different konc. outside and inside) of a certain substance, transporting molecules in/out, reacting to outside signals, et.c. et.c.

Answer 2

1.)THE CELL-WALL HELPS TO PROTECT THE CELL.2.)THE CELL-WALL ALSO HELPS TO SUPPORT THE CELL.