Biology 1001A Chapter 5: Chapter 5 Readings.docx
20 Apr 2013
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Cystic fibrosis : suffer from a progressive impairment of lung and gastrointestinal function. Caused by mutation to a gene that codes for a protein called the cystic fibrosis transmembrane conductance regulator (cftr) Normal cftr : cl is pumped out of the cells that line lungs and intestinal tract keep the lining wet. 5. 1 an overview of the structure of membranes. Development of plasma membrane : key to evolution acts as selective permeable barrier allowed for compartmentalization of processes and increased complexity. 5. 1a a membrane consists of proteins in a fluid of lipid molecules. The fluid mosaic model proposes that the membrane consists of a fluid lipid bilayer in which proteins are embedded and float freely. The model refers to the fact that most membranes contain an assortment of different types of proteins. Proteins move much slower than lipid molecules cause they are bigger. Membranes are asymmetrical (reflects the differences in the functions performed by each side of the membrane .
