BIOL 1012 Chapter Notes - Chapter 5: Fluid Mosaic Model, Lipid Bilayer, Thermal Energy
Document Summary
5. 1 membranes are fluid mosaics of lipids and proteins with many functions. Fluid mosaic model- describes the membranes many protein molecules. Figure 5. 1 suspended in the fluid phospholipid bilayer. 5. 2 the spontaneous formation of membranes was a critical step in the origin of life. Phospholipids are the key parts of membranes. First organic molecules to form from chemical reactions. When phospholipids are mixed with water, the phospholipids organize into bilayers surrounding bubbles. Formation of membrane-enclosed molecule s was an important step to the. Membranes can separate a solution that"s different from its surroundings evolution of cells. 5. 3 passive transport is diffusion across a membrane without energy investment. Diffusion- particles spread out into open space. Eventually, solutions on both sides will have equal concentrations of dye. Dynamic equilibrium - molecules continue to move back and forth but there"s no change in concentration on either side. Each diffuses down its own concentration gradient across its membrane.
