ASSIGNMENT
TOPIC: CELL MEMBRANE
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INTRODUCTION
Cell tissue layers are crucial 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 between the contents of for each one organelle and the cytosol. Ion gradients crossways membranes, established by the activities of specialized membrane proteins, can be used 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 contains proteins that act as sensors of external signals allowing the cell to change its behavior in response to environmental cues; these protein sensors, or receptors, transfer information or else than ions or molecules across the membrane.
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THE STRUCTURE OF THE CELL MEMBRANE
All biologic membranes have a common general structure: each is a very thin film of lipid and protein molecules, held unitedly mainly by non covalent interactions. Cell membranes are dynamic, mentally ill structures, and most of their molecules are able to move about in the plane of the membrane. The lipid molecules are arranged as 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 dissolved in the lipid bilayer mediate most of the other functions of the membrane, transporting specific 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: Orderessay
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