write the differences between cell wall and plasma
membrane
Answers
Explanation:
Plasma Membranes are semipermeable and have receptors which help in cell-cell communication, whereas Cell wall is completely permeable and does not have any receptors. Plasma Membrane protects protoplasm and checks the entry of molecules.
Plasma Membrane is the phospholipid layer, found in all types of cells; it helps in protecting the protoplasm and checks the passage of molecules inside the cell, Though cell wall is found in the plant cell, fungi, bacteria only and protects the cell from external shocks, and provide rigidity and shape to the cell. The cell wall is the outermost boundary of the cell (if present), and plasma membrane is present in the inner lining of the cell.
The plasma membrane is delicate thin layer while cell wall is the thick and rigid layer. Plasma Membrane is selectively permeable membrane allowing small molecules entry only; their layer is made up of lipids and proteins and few carbohydrates, while Cell wall constituents may vary from chitin, peptidoglycan, and cellulose.
Complexity in the cell becomes higher from the lower level of uni-cellularity to the higher level of multicellularity, but they share many things common. In this content, we will discuss the difference between the plasma membrane and cell wall and few of their similarities also.
Content: Plasma Membrane
BASIS FOR COMPARISON PLASMA MEMBRANE CELL WALL
Meaning Plasma Membrane is a delicate, thin structure of around 5-10nm wide and is visible under electron microscope, and it is present in all types of cell, helps in the passage of molecules and protects the protoplasm. Cell Wall is a thick, rigid structure of around 4-20um wide and is visible under light microscope; it is present in plant cell, bacterial and fungal cell, helps in providing
shape and rigidity to the cell.
Presence Plasma Membrane is present in all types of cells. Cell Wall is present in the plant cell, bacteria, fungi and algae.
Composition Made up of lipids and proteins and carbohydrates. Made up of cellulose (plant cell), chitin (fungi), and peptidoglycan (bacteria).
Structure Thin layers and is visible only through the electron microscope. Thick layers which are visible through the light microscope.
Permeability Semi-permeable. Completely permeable.
Receptors Plasma membrane have receptors, helps in cell-cell communication. Cell wall does not have receptors.
Metabolic function Metabolically active and living. Inactive and non-living.
Thickness Same thickness throughout its life. Thickness grows with life.
Nutrition Need proper nutrition to survive. Doesn't need any nutrition from cell but deposition instead.
Functions 1.Protects protoplasm.
2.It separates the components present inside to outside environment.
3.Helps in cell-cell communication.
4.It allows the passage of molecules 1.Cell wall provides rigidity to the cell, protect the cell from external shock and other mechanical forces.
2.It is responsible for cell morphology.
3.It prevents large molecule to enter into the cell.
4.Also, prevent the cell from being toxic.
5.Helps in maintaining the osmotic environment of the cell.
Definition of Plasma Membrane