receptor proteins cell membrane

Cell membrane is present in both plant and animal cells. It is living, elastic and made of proteins and lipids (fats). Its function is to provide a mechanical barrier for the protection of the inner cell contents and to regulate the movement of mol..

We have discussed many dramatic effects of hormone, for instance, testosterone. Yet, its concentration in the plasma of adult human male is only 30 to 100 ng per ml. How can hormones in such tiny quantities have such widespread and selective actions? Unlike catecholamine and peptide hormones, ster..

Proteins - Proteins, which constitute about 10 to 12% of the cell contents, are macromolecules having a significant role in the metabolism of a cell. Proteins are polymers of amino acids. Each protein is a linear, unbranched, polypeptide m..

The plasma membrane or cell membrane surrounds the cell contents in all types of cells. It is a multipurpose covering composed of phospholipids and proteins..

Plasma Membrane - The plasma membrane or cell membrane surrounds the cell contents in all types of cells. It is a multipurpose covering composed of phospholipids and proteins. fig. 16.4 - Cell Membrane Apart f..

The cell membrane and the membranes of various cell structures exhibit the same structure and as such perform the same functions. However, the amount and arrangement of phospholipids and proteins varies in different cells and organelles. T..

Responsible for muscle contraction for movement and locomotion Example : Myosin Harmones Some harmones are proteins. Harmones regulate body functions Example : Insulin Structural Proteins form parts of cells and tissues Example : Collagen Protective ..

Membranous Cell Organelles - Most of the organelles in the cell are bound by unit membranes similar to the cell membrane. Following are the membrane-bound organelles, which can be recognized in a generalised eukaryotic cellh..

Most of the organelles in the cell are bound by unit membranes similar to the cell membrane..

The molecular structure of cell membrane is still not clearly known. Several models have been proposed from time to time to explain its structure based on its physico-chemical properties. In the year 1935 Danielli and Dawson proposed that the cell membrane is..