Many small gas molecules, water, glucose, etc are neutral compounds. Thus it maintains a definite concentration gradient. Therefore, it regulates the flow of materials and ions.
Lipid soluble substances easily cross the membrane than others. Thus it is known as a differential permeable or selectively permeable membrane. It allows selective substances to move across the membrane. Plasma membrane forms a barrier between the cell contents and the outer environment. Differentially Permeable Membrane (semi-permeable): Transport of material is a vital role of the plasma membrane. Functions of Plasma Membrane :įunctions of the plasma membrane are enlisted here. As they are a key component in coordinating cell behavior in animals. The glycocalyx helps in the recognition of cells.
These sugar molecules behave as a molecular “fingerprint”. There are peculiarly shaped groups of sugar molecules in glycocalyx. Surface carbohydrates and some of the proteins and lipids make up the cell coat which is called the glycocalyx. The carbohydrates unite with lipids to form glycolipids on the surface of a plasma membrane. The carbohydrates and proteins collectively form glycoproteins. The carbohydrates in the plasma membrane are present in two forms: (c)Some attach the membrane to the cell’s inner cytoskeleton or various molecules outside the cell. (b) Some intrinsic proteins help ions or molecules in movement across the membrane. (a) Some intrinsic proteins are linked to sugar-protein markers on the cell surface. The intrinsic proteins perform the following functions: Modern technology shows that lipid bilayers are not sandwiched between two protein layers. This unit membrane is present in all cellular organelles. This basic structure is called a unit membrane. The lipid bilayers are sandwiched between inner and outer layers of protein. Which are given below Unit Membrane Structure:Īccording to this model, the membrane is composed of lipid bilayers.
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