BIOL 118 Lecture Notes - Lecture 11: Encase, Quorum Sensing, Signal Transduction
13 Oct 2016
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Document Summary
The plasma membrane is made up of a phospholipid bilayer with may interspersed proteins: proteins may be integral or peripheral. Primary function of plasma membrane is to create an environment insid the cell different from the outside conditions. The selective permeability of the membrane controls the flow of materials into and out of the cell. Fiber composite layer is a cross linked network of long filaments surrounded by a stiff ground substance. Function-rods or filaments protect against tension, ground substance protects against compression. Ecm extracellular matrix is fiber composite in animals: most important feature is structural support. Ecm consists of: ground substance formed of gelatinous polysaccharide (what is ground substance?, the most common ecm protein fiber is collagen. Forms a flexible extracellular layer: ecm also helps cells stick together, form protein-protein attachments, and link the ecm directly to the cells cytoskeleton. Ecm is strengthened by connections to transmembrane proteins.
