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Cellular membrane are fluids mosaics of lipid and proteins, in the first…
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- in the first used electron microscopes to study cells in 1905, all the pictiures taked had or supported the Davson Model (the sanswich)
it becomes like final the structure not only of the plasma membrane but also of all the cell's internal membranes.
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- Building from the main idea that phospolipid bilayer was the main fabric of membrane,the next question was where the poteins were located
- Most of the lipids and some of the proteins can shift about laterally. The lateral movement of phospholipids within the membrane
is rapid.
2,1 which means that a phospholipid can travel about 2 11m-the length of many bacterial cells-in 1second. Proteinsare much larger than lipids and move more slowly.
For example: "Phospholipids" form the main fabric ,membranes but , proteins can determine each fuction to each cell
Membrane carbohydrates are usually short, branched chains
of fewer than 15 sugar units.
Some are covalently bonded to
lipids, forming molecules called glycolipids.
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then inside the Golgi aparatus, the glycoproteins undergo futher carbohydrates modification
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there the vesicles fuse with the membrane, relasing secretory proteins from the cell