Question

What is cell wall and cell membrane composed of and how do they differ in their functions?

Answer 1

the outer most covering of cell is called cell wall.
the layer which allows the certain material to pass in and out is called cell membrane

Answer 2

Hello!!

_______________________________

Cell Wall:

➡️ The cells of bacteria, fungi algae and plants have an additional non-living rigid structure called the "cell wall" that surrounds the plasma membrane.

Functions of Cell Wall:

➡️ It maintains shape of the cells.

➡️ it protects the cell from mechanical injury.

➡️ It wards off the attacks of pathogens like viruses , bacteria and fungi.

➡️ It allows the material to pass in and out of the cell.

➡️ It helps in cell-to-cell interaction and provides Barrier to undesirable macromolecules.

Cell Membrane:

➡️ Plasma membrane is an absolute requirement for all living organisms as it is responsible for the relationship of a cell with the outside world.

➡️ Cell membrane is composed of lipids that are arranged in a bilayer.

➡️ In human beings, the membrane of the erythrocytes has approximately 52% protein and 40% lipids.

Functions of Cell Membrane:

➡️ The fluid nature of the membrane is important from the point of view of functions like cell growth, formation of intercellular junctions, secretion, endocytosis, cell division etc.

➡️ Plasma membrane allows the transport of the molecules across it.

➡️ The membrane is selectively permeable to some molecules present on either side of it.

➡️ The passage of substances across cell membrane occurs by various methods such as passive transport and active transport.

_______________________________

Thanks!!