Question

Difference between Cell Wall and Cell Membrane .

Answer 1

cell membrane:
•Cell membrane is present in all types of cells. i.e human, animal, plant, bacterial etc.
•Cell wall is Present in only plantcells and bacterial cells.2Cell membrane is an organelle of the cell. And is outermost cover in animals and humans. It provides shape to cell which is flexible.
•It is a lipid bilayer. And is made of lipo-proteins.
This has the ability to contract. It is flexible to change the shape as needed.
•Cell membrane has receptors to receive signals from external chemicals.
•In Bacteria, cell membrane gives rise to flagella (movement) and pilli (reproduction) like structures.
•It is of the same thickness in the whole life time of the organism.
•The membrane is permeable and controls the movement of substance into and outside the cell. That is, it can allow water and other substance to pass through selectively.

cell wall:
•Cell wall is Present in only plantcells and bacterial cells.
•Cell wall is the outer non-living cover of the cell but not an organelle. It encloses cell membrane. It also provides a fixed shape
•This is made of pectin, chitin, lignin etc. In bacteria it is made of glyco-proteins, glyco-lipds
Cell wall is rigid with fixed shape. Any pressure application can break the wall.
•Cell wall lacks any receptors.
While cell wall facilitates flagella and pilli through small apertures.
•The wall grows in thickness over time. Further, it occupies whole cell in plant as the cell ages and dies.
•The cell wall is semi-permeable. It allows passage of substances with size of 30-60kD.

Answer 2

1.Cell wall is found in plant cell andcell membrane is found in animalcells. ... 3.Cell wall is completely permeable whereas cell membrane is semi-permeable. 4.Cell wall is made up of cellulose and cell membrane is made up of lipids and proteins..