Check new design of our homepage! Understanding Its Structure and Functions Mitochondria are called the 'powerhouse of the cell'. They contain a number of enzymes and proteins that help process carbohydrates and fats obtained from the food we eat to release energy. Read on to know about the structure and functions of the organelle.
Call online on Skype Structure and function of cell membranes It is a well known fact that cell is an integral part of any living body. But the structure and function of the cells are not alone controlled by the organelles present within it; rather it depends upon the membranes as well. Therefore, cell membranes are the part of any cell that divide the interior of the cell with the exterior and also define compartment of different cell organelles.
Structure of cell membranes: All the cell membranes have a common structure that includes phospholipids bilayer along with the involvement of particular proteins that carries on different functions.
These are the building block of cell membranes that has two hydrophobic fatty acid chain linked to phosphate containing hydrophilic head group. Therefore, one end of this molecule is polar and the other end is non- polar.
The non- polar ends extend in one direction somewhat parallel to each other forming the tail portion and the polar end points in other direction forming the head.
Since, water is polar in nature; therefore the non- polar ends or the tail of phospholipids packs close together away from the water and the head portion, i. This creates the barrier for any kind of water soluble molecule which is the main property of the phospholipids. Other than this, fluidity of lipid bilayer is the other main property of lipid that allows free rotation of these molecules.
Like the phospholipids, proteins are also the main component of cell membrane. The proteins are embedded between the lipid bilayer and thus this combination provides cell membrane its structure and helps in carrying different functions.
Proteins here are classified into two groups: Both these types are different because on one hand integral membrane protein communicates directly with the lipid bilayer whereas peripheral protein carries indirect communication by the help of integral protein. The involvement of phospholipids and protein in the structure of cell membrane gave rise to two different models or structure for the cell membrane.
According to Davson and Danielli, the phospholipids in embedded between the bilayer of protein and hence called the sandwich model of plasma membrane.
But this model was not accepted. According to this, proteins are embedded between the phospholipids bilayer that makes structure of cell membrane and helps in its functioning. This model was accepted worldwide.
Function of cell membrane: In this case, small molecules that are not charged can easily pass through the membrane. Likewise, those molecules that are non-polar and smaller in size can also pass through the membrane, infact small molecules that are polar but uncharged comes on the same category where they can cross the membrane by diffusion.
But the larger, molecules whether charged or uncharged cannot diffuse through the membrane that slimly. Still, among them some molecules can cross the membrane, not directly but with the help of transport proteins.
These proteins have membrane spanning region that forms the passage in the lipid bilayer making pathway for some polar molecules to cross the membrane.You'll get detailed explanations for all your mistakes and weekly progress reports Easily improve any text · Write anywhere · Detect plagiarism · Eliminate grammar errorsGrammarly quickly and easily makes your writing better.
– kaja-net.com Chapter title: Membrane Structure and Function. The “ability of the cell to discriminate in its chemical exchanges with the environment is fundamental to life, and it is the plasma membrane that makes this selectivity possible. View Test Prep - Chapter 1- Cell Structure and kaja-net.com from PATHO at Keiser University.
A) Ans: B) Ans: C) kaja-net.comgh the basic structure of the cell plasma membrane is formed by a lipid. A cell is a dynamic and a complex construction surrounded by a membrane known as the plasma membrane. This acts like a barrier between the interior of the cell and the outside resulting in different chemical environments on the two sides.
The diverse functions performed by biological membranes can be attributed to the molecular composition and structure of these membranes. Models for Cell Membrane Structure It took almost a century to develop the present accepted model of a cell membrane based on .
What is the advantage of being small and why is outer surface area important to a microorganism, ie. what is the ultimate effect? Cell Membrane.