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Unformatted text preview: Biol110- Fall 2010-Cell Biology Cell compartmentalization is achieved by the use of membranes, which are composed of phospholipid bilayers. Membranes make life on Earth possible, but they also present a great problem, as they impose barriers to nutrient diffusion and to intracellular transport
Assigned reading for next class: Chapter 11 (pg. 651-683) Characteristics of biological membranes- (e.g. the plasma membrane)1. fluidity 3. function Outside 35-50 Å Inside The membrane encapsulates cellular components and maintains an equal solute concentration between the inside and the outside of the cell. A biological membranes’ main function is to segregate chemicals. Membranes impose barriers to diffusion 2. morphology Intracellular membranes serve as physical barriers that allow compartmentalizationMembranes everywhere… Freeze fracture electron microscopy revealed the presence of proteins in cellular membranes- Biomembrane composition (a mosaic)- Movie: Biomembranes ”The fluid mosaic model” http://...
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