Street Studies

Cell Membrane is an important part of the cell. It helps in various activities done by the cell. The function of cell membrane are  given below – 1. Regulation of Shape In animal cells it is the outer membrane of the cell. It controls the cell shape. 2. In Security It protects the protoplasm from external injuries and also has the ability to heal the injury or wound. read more :  Surrogacy     ,     Surrogacy Regulation Bill 3. As a Barrier It separates the intracellular fluid or  cytoplasm from extracellular fluid, which is a very important work. 4. In the Transport of Substances  V arious types of substances enters & excreted from the cell when needed. The transport of substances are done by following process –                             i.            Passive Transport Or Osmosis Energy is not involved in th...

There are many theories related to the cell membrane structure, which is given below :-   Lipid & Lipid Bilayer Model  Lipid Bilayer Protein Model Or    Danielli & Davson Model  Micellar Theory  Unit Membrane Model  Protein Crystal Model  Fliud – Mosaic Model  Lipid-Globular Protein Mosaic Theory read more :    Atmosphere : An Introduction     ,        Layers of the Atmosphere 1.    Lipid & Lipid Bilayer model   By Charles Overton , 1895 –    The cell membrane is composed of a very layer Lipids. By Gorter & Grandel , 1926 –  The plasma membrane is composed of a dual layer of Lipids. Each layer’s polar end are positioned outward and tails are facing inward position. This theory puts the base for the theories related to the cell membrane structure.  2.  Protein  - Lipid Bilayer Model Or Danielli & Davson Model , 1935 This theory is also know...

The cell has a different internal environment from that of external environment. The difference is maintained throughout the life of cell by the thin membrane, known as cell membrane or plasma membrane. It covers the protoplasm. It is also known as   Plasma Membrane or Plasmalemma.    In animal, this is outer most layer of the cell while in plants it is present beneath the cell wall. read also :  Begining of The Life - The Cell : A Discovery  Structure of Cell Membrane Or Plasma Membrane Cell Membrane Or Plasma Membrane : Structure             i.          It is normally composed of Lipid and protein.          ii.           The composition is : protein – 60 to 80 % , Lipid – 20 to 40 % , cellulose – few , Enzymes – few , water – about 20% of whole weight.          iii.       ...

Plants cell wall thickening provides strengthening to the tissues, structural sup port, enabling upright growth, enhancing resistance to environment. it allows plants to withstand gravity, maintain their shape and protect themselves from damage caused by various factors such as pathogen, insects, extreme temperature etc. read also :  Most Route Changing River in India - Kosi or Dormant Kosi River Thickening   of Cell Wall Thickening of the cell is oftenly done after the cell development. “The process of deposition of substances on the cell wall after cell development, is called as thickening of cell wall. This process is occur only in those cells whose function is transportation and to provide mechanical support. Thus the thickening of cell wall is found in vessels and tracheids cells. Thickening of Cell Wall Various types of substances are deposed off on the cell wall , by which it is classified into following category – read more :   Bt Toxin    ,  ...

On the presence of Cell Wall , the plant cell and an animal cell are differentiate into different sections. We already know that cell wall is absent in animal cells. Different groups such as bacteria, fungi, algae & plant cells possess cell wall but their composition is different. We take a look on these structures – read more :  Earthquakes : Causes, Types and Prevention A.    Cell Wall of a Bacteria We know that bacteria is a prokaryotic cell. The structure of a Bacterial cell wall is complicated in comparison to their structure. It is about 100 A 0  – 250 A 0  thik , rigid & complex in structure. The cell wall is made of polysaccharide, lipid and protein. Beneth the cell wall, there is a cell membrane present which is made of protein and lipid. On the basis of structure & the characteristic of color regent reactions, it is classified into Gram positive and Gram negative bacteria. It has peptidoglycan ( made of two elements – peptide & Glycan )...