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Carbohydrates are compounds of carbon and hydrogen that play an essential role in cell-to-cell recognition. It is essential for sorting cells into tissues and rejecting foreign cells by the defense system.

Carbohydrates present in the membrane are short and branched. These are covalently bonded to the lipid of the membrane and are called glycolipid, and if covalently bonded to the protein of the membrane, they are termed glycoprotein. Glycoproteins are much more in number than glycolipids.

All the membranes have distinct inside and outside, or simply every membrane has two faces, the inner face and the outer one.

These sides may vary in lipid composition on both sides. It provides the directional orientation to attached proteins and other molecules. It also helps in distinguishing the two proteins from each other and their location.

The structure of the membrane or proteins associated with it is built inside the endoplasmic reticulum. It goes to the Golgi apparatus for modification and then finally reaches the destination called the cell membrane.

The component is called the cell membrane, and lipid and proteins are synthesized inside the ER. These proteins and carbohydrates are attached to form glycoproteins. From the ER, glycoproteins are carried to the Golgi apparatus in the vesicles.

These vesicles on the inside contain carbohydrates components, and on the outside contain cytoplasmic components. They get modified inside the Golgi body. From there, it is transported to the membrane of the cell.