What are the 5 functions of the cell wall?
The functions of cell wall are:
- It provides protection to the cell and prevents from any physical damage.
- It provides structure to the cell.
- It prevents from osmotic bursting.
- It protects the protoplasm against mechanical injury.
- It controls intercellular transport.
What is the function of the cell wall in a plant cell?
It provides a structural framework to support plant growth and acts as the first line of defense when the plant encounters pathogens. The cell wall must also retain some flexibility, such that when subjected to developmental, biotic, or abiotic stimuli it can be rapidly remodeled in response.
What is the basic structure of a cell wall?
The plant cell wall is generally arranged in 3 layers and composed of carbohydrates, like pectin, cellulose, hemicellulose and other smaller amounts of minerals, which form a network along with structural proteins to form the cell wall. The three major layers are: Primary Cell Wall. The Middle Lamella.
What is ultrastructure of chloroplast?
The chloroplast has an inner and outer membrane with an empty intermediate space in between. Inside the chloroplast are stacks of thylakoids, called grana, as well as stroma, the dense fluid inside of the chloroplast. These thylakoids contain the chlorophyll that is necessary for the plant to go through photosynthesis.
What is the ultrastructure of a prokaryotic cell?
Each prokaryotic cell is essentially a one envelop system that consists of protoplasm encased within cell envelope. The ultrastructure of a prokaryotic cell, particularly a typical bacterial cell consists of cell envelope, cytoplasm, nucleoid, plasmids and surface appendage.
How does the structure of the cell wall support its function?
A major role of the cell wall is to form a framework for the cell to prevent over expansion. Cellulose fibers, structural proteins, and other polysaccharides help to maintain the shape and form of the cell. Additional functions of the cell wall include: Support: The cell wall provides mechanical strength and support.
What are the 3 layers of the cell wall?
These components are organized into three major layers: the primary cell wall, the middle lamella, and the secondary cell wall (not pictured). The cell wall surrounds the plasma membrane and provides the cell tensile strength and protection.
What are the functions of cell wall and cell membrane?
Difference between Cell Wall and Cell Membrane
| CELL WALL | CELL MEMBRANE |
|---|---|
| Functions include protection from the external environment. | Functions include permeability, signal reception, motility conduction, cell division, sexual reproduction, etc. |
What is the structure of a cell membrane and its function?
The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.
What is ultrastructure of mitochondria?
Mitochondria has two membranes, one is an internal membrane and the other is an outer membrane. Inner membrane has layered structures, called cristae. The outer membrane covers the organelle. The outer membrane covers the surface of the mitochondrion.
What is ultrastructure of nucleus?
Nucleus is the controlling centre where the master molecule DNA directs the entire activity of the cell. It consists of a nuclear membrane or envelope with pores, the nuclear sap or nucleoplasm, chromatin fibers (DNA) and nucleolus. Nuclear membrane: is double layered membrane.
What is ultrastructure of eukaryotic cell?
ULTRASTRUCTURE OF THE EUKARYOTIC CELL Eukaryotic cell, which has a nucleus that is enclosed in a nuclear envelope and several membrane- limited compartments e.g. the human cell. 2. Prokaryotic cell which has no nucleus and is devoid of membrane-limited compartments e.g. the bacterial cell.
What is cell wall explain its structure with diagram?
Difference between Cell Wall and Cell Membrane
| CELL WALL | CELL MEMBRANE |
|---|---|
| It is the thick and rigid structure with a fixed shape. | It is a thin and delicate structure. It is flexible to change the shape as needed. |
| It protects the cell from the external environment. | It protects and maintains the internal environment of the cell. |