Cell Memebrane

cellular phone BIOLOGY AND GENETICS ASSIGNMENT TOPIC: CELL MEMBRANE [pic] INTRODUCTION Cell tissue layers are all important(p) to the life of the cell. It encloses the cell defines its boundaries, and obligates the essential difference amidst the cytosol and the extra cellular environment. Inside the cell the membranes of the endoplasmic reticulum, Golgi apparatus, mitochondria, and other membrane bound organelles in a eukaryotic cell maintain the char fleckeristic differences among the contents of for all(prenominal) one organelle and the cytosol. Ion gradients crossways membranes, conventional by the activities of specialized membrane proteins, can be apply to synthesize ATP to drive the transmembrane movement of selected solutes, or in nerve and muscle cells, to produce and transmit electrical signals. In all cells the plasma membrane also cont ains proteins that act as sensors of external signals allowing the cell to change its behavior in solvent to environmental cues; these protein sensors, or receptors, transfer information or else than ions or molecules across the membrane.

[pic] THE STRUCTURE OF THE CELL MEMBRANE All biological membranes have a common general structure: each is a very thin film of lipoid and protein molecules, held in concert mainly by non covalent interactions. Cell membranes are dynamic, mentally ill structures, and most of their molecules are able to move more or less in the plane of the membrane. The lipid molecules are arranged a! s a continuous double layer about 5nm thick. This lipid bilayer provides the prefatory structure of the membrane and serves as a relatively water-resistant barrier to the passage of most water-soluble molecules. Protein molecules fade out in the lipid bilayer mediate most of the other functions of the membrane, transporting precise molecules across it, for example, catalyzing membrane associated reactions, such as ATP synthesis. In the...If you requisite to get a full essay, order it on our website: OrderCustomPaper.com

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