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Chapter 5 Cell Membrane

Chapter 5 Cell Membrane - Miguel Alvarez LS2 Tutor Winter...

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Miguel Alvarez LS2 Tutor Winter 09 Week 2 B Chapter 5: Membranes I. Fluid Mosaic Model a. Phospholipid bilayer, in which membrane proteins “float”. b. Attached to the proteins or phospholipids are carbohydrates (oligosaccharides) that aid in cell signaling. II. Different Type of proteins in cell membrane a. Integral Membrane Proteins: i. Can be partially or fully inserted in the membrane. ii. Some proteins are restricted to staying put (because they may be anchored to the cell . b. Peripheral Membrane Proteins: i. Do not penetrate the bilayer ii. Attach to surface by ionic bonds . c. Transmembrane Proteins: i. Fully inserted into the membrane with direction. ii. extracellular and intracellular components may serve different functions, such as proteins activated by hormones. III. Cell Connections a. Tight Junctions: (seals tissues) prevent molecules from passing through space between cells, forcing them to go through the cells.
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