define cell wall and cell membrane
Answers
Cell wall and cell membrane both are constituents of a cell. The main difference between cell wall and cell membrane is, cell membrane is present in all cells but cell wall is only present in plants, bacteria, fungi and algae. ... Cell membrane is partially permeable but cell wall is completely permeable.
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cell wall-
The cell wall is the tough, flexible but sometimes fairly rigid layer that surrounds some types of cells. It is located outside the cell membrane and provides these cells with structural support and protection, in addition to acting as a filtering mechanism. A major function of the cell wall is to act as a pressure vessel, preventing over expansion when water enters the cell. Cell walls are found in plants, bacteria, fungi, algae, and some archea. Animals and protozoa do not have cell walls.
cell membrane
Cell membrane or plasma membrane is the outer most covering of the cell that separates the contents of the cell from its external environment. It is present in both animal and plant cells.
Functions of cell membrane:
It gives definite shape to the cell.
It is selectively permeable membrane.
It separates the contents of cell from its surrounding medium.
It regulates the movement of ions in an out of the cell.
It provides mechanical barrier for the protection of the internal contents of the cell.
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