THE ROLE OF PROTEINS, LIPIDS AND CHLORESTOL

THE ROLE OF PROTEINS, LIPIDS AND CHOLESTEROL

PROTEINS AND THEIR ROLE:
TRANSPORT:
Transmembrane proteins from water channels through which the transport of material and ions takes place.
CELL RECOGNITION:
Extrinsic proteins help in the recognition of the cell and foreign particles.

ADHESION:
Some of the proteins help in the adhesion of cell to each other.

ROLE OF LIPIDS:
AS ANTI-FREEZE:
Unsaturated Fatty acid tails helps in protecting the cell membrane from freezing.

ROLE OF CHOLESTEROL
*) Cholesterol prevents the plasma membrane from overexpansion.
ROLE OF GLYCOLIPIDS AND GLYCOPROTEINS:
*) It helps in the formation of glycocalyx, which in some bacteria facilitate attachment to the substrate. Furthermore acts as hormone receptors.
FUNCTION OF PLASMA MEMBRANE:
CELL SHAPE:
Plasma membrane gives specific shape to the cell.
PHAGOCYTOSIS:
Plasma membrane helps in phagocytosis and pinocytosis
EXCREATION:
Plasma membrane helps in the excretion of the waste materials from the cell, (urea,uric acid etc.)
CELLULAR SECRETION:
Plasma membrane helps in the secretion of useful substances (hormones, enzymes, etc.)
Plasma membrane prevents the escape of cytoplasmic organelle from the cell.