BIOL 1000 Chapter Notes - Chapter 5: Symporter, Osmosis, Signal Transduction
Document Summary
5. 1- an overview of the structure of membranes. Key to evolution of life was plasma membrane. Plasma membrane selectively permeable barrier for cell, that uptakes import. minerals and gets rid of cell waste and keeps protected environment for metabolism to take place. Development of internal membranes allowed for splitting processes and increased complexity (ex: nuclear envelope to protect nucleus of cell) Fluid mosaic model membranes are not rigid with molecules embedded with proteins float around rather than being locked in place. Lipid molecules of membrane exist in a double layer. Lipid molecules move in various ways on a certain side of the double layered membrane and exchange places within a layer million times a second. Therefore the lipid molecules in the membrane are known to be dynamic. Maintaining fluidity in membrane is highly import. to overall membrane function. Mosaic means membranes contain wide assortment of diff. types of proteins, with specific functions.