➡️ 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.
➡️ 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.
A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection, and also acts as a filtering mechanism. In bacteria, the cell wall is composed of peptidoglycan. The structures of the cells and cell walls are the Endoplasmic Reticulum (a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis.) The Nucleus is like the brain of the cell, controlling what processes occur in the cell. Mitochondria supply glucose and supply energy to other function in the cell. These are only a few of the features in a cell or cell wall.
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cell membrane =A Thin membrane that surrounds the protoplasm of every cell.
cell wall= plant cell and animal cell generally definite shape due to a rigid cell wall around them.
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cell wall :-
1. it is made up of cellulose
2. it is freely permeable
3.it is the outer boundary of plant cell
1.it is made up of lipoprotiens
2.it is selectively permeable
3.it is found both in plant and animal cell
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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. It is not present in the Protozoa and animal cell. Cell wall covers the cell membrane, which is a partially permeable membrane.
Cell membrane is also known as plasma membrane or plasma lemma, cell wall is not.
Cell membrane is found in animal cells and cell wall in plant cells.
Cell wall covers the cell membrane and forms the outer covering.
Cell membrane is partially permeable but cell wall is completely permeable.
Cell membrane do not contain cellulose, cell wall does.
Cell wall is elastic, cell membrane is not.
Cell wall controls turgidity of a cell, plasma membrane does not.
Cell wall made up of peptidoglygan is present in a bacteria.
Cell wall made up of chitin is present in fungi.
Cell wall is metabolically inactive but cell membrane is metabolically active.
Cell wall protects the shape of the cell and maintains it while cell membrane protect the cytoplasm and osmotic balance in a cell.
Plasma membrane allows some materials to pass through it while blocks other materials from entering through it. So, cell membrane is called selectively permeable.
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It is a semi-permeable membrane composed of lipids and proteins. The main functions of the cell membrane include: Protecting the integrity of the interior cell. Providing support and maintaining the shape of the cell.Cell membrane is called selectively permeable membrane because it allows only selected minerals or particles to enter.
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Plant cells have a cell wall, a large central vacuole, and plastids such as chloroplasts. The cell wall is a rigid layer that is found outside the cell membrane and surrounds the cell, providing structural support and protection..
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