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Download Fig. 4.3 - glenbrook s hs
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Transcript
Membranes of the Cell • Plasma membrane – cell’s outer membrane • Endomembranes – smooth and rough endoplasmic reticulum, golgi, vacuole and lysosome • Membraneous envelopes – nucleus, cholorplast and mitochondria Membrane Features • Semi-permeable (selectively permeable) – allows some substances to pass through, but blocks the passgae of other substances • Membranes enclose and maintain the specific chemical environment • Every membrane carries out its specific functions Membrane Structure • Two layer membrane called phospholipid bilayer – composed of protein and lipids – Lipids are called phospholipids – Contain 2 fatty acids instead of 3 • Fatty acids are hydrophobic – Water fearing – Avoid water – Contain a phosphate group in place of 3rd fatty acid • Phosphate group is charged making this hydrophilic – Water loving – Mixes with water • Specific proteins are inserted into the phospholipid bilayer to… a. b. c. d. Attach to cytoskeleton Cell signaling Enzymatic activity Transport Passive and Active e. Intercellular joining f. Cell-cell recognition Membranes and Proteins Fig. 4.23 Flexibility • Membranes are not rigid • Proteins move freely in the plane of the membrane • Called the Fluid Mosaic model Fluid = molecular wanderings Mosaic = diversity of protein
