Notes on Membrane Structure and Function
Title: Notes on Membrane Structure and Function
Category: /Science & Technology/Biology
Details: Words: 1206 | Pages: 4 (approximately 235 words/page)
Notes on Membrane Structure and Function
Category: /Science & Technology/Biology
Details: Words: 1206 | Pages: 4 (approximately 235 words/page)
*Membrane Structure and Function
*Selective permeability- allows some substances to cross it more easily than others
*Phospholipids are the most abundant lipids in membranes
<Tab/>*An amphipathic molecule (has both hydrophilic and hydrophobic region), proteins too
*Overton hypothesized that membranes are made of lipids
*Langmuir made artificial membranes by adding phospholipids dissolved in benzene to water
*Benzene evaporated, phospholipids remained as a film covering the surface of water with only the
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Receptor-mediated endocytosis occurs when ligands (extracellular substances that bind to specific receptor sites) cluster into regions of the membrane called coated pits; a fuzzy layer of proteins deepen the pit and form the vesicle; enables the cell to acquire bulk quantities of specific substances; take in cholesteroil for use in the synthesis of membranes and as a precursor for the synthesis of other steroids
*cholesterol travels in the blood in particles called low-density lipoproteins (LDLs)