Cell wall Vs plasma membrane

General Knowledge on Cell Wall | Cell Biology | cell-biology

Cell wall Vs plasma membrane

The plasma membrane of a cell surrounds the cytoplasm and limits passage of materials from the outside world into the cell and vice-versa. It is a phospho-lipid bilayer with proteins and glycoproteins embedded in it. This hydrophobic (water-averse) barrier truly separates the watery environment inside a cell from the watery environment outside of it. Only certain types of molecules can cross it.

A cell wall, by contrast, is outside of the plasma membrane and interacts more extensively with the outside world. It usually consists of glycoproteins (proteins with small carbohydrate chains attached) and proteoglycans (complex sugars with some peptide chains attached). These molecules bind a lot of water and keep the environment of the cell hydrated.

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