Essay On Cell Membrane
Answers
This acts like a barrier between the inside of the cell and the outside resulting in different chemical environments on the two sides. The cell membrane is not restricted to the outer surface but is also present inside surrounding the organelles.
Answer:
The cell membrane is a phospholipid bilayer that are selectively permeable membranes which separate the interior of the cells (cell organelles and cytoplasm) from the outside environment or the extracellular space.
These biological membranes or bilayers are made up of amphiphilic phospholipids which have both hydrophilic phosphate head and a hydrophobic tail that consists of two fatty acid chains.
Lipoproteins are single layered membrane composed of phospholipid molecules on their outside which surrounds a central core.
⇒Present in both cell structure of the prokaryotic cell and eukaryotic cell
⇒The cell membrane, or plasma membrane, is a biological membrane that surrounds the cytoplasm of a cell. In animals, the plasma membrane is the outer boundary of the cell, while in plants and prokaryotes it is usually covered by a cell wall.
⇒It is flexible and elastic
⇒A cell membrane is called a selectively permeable membrane. Why? This is because it allows the materials in and out of the cell according to the requirement of the cell.
⇒Structure: It is made up of bilipid layer and protein (Fluid Mosaic Model)
⇒Functions: Encloses the contents of a cell.
⇒Provides shape
⇒Allows transport – Transport is of two types- Diffusion and osmosis