BIOL 1201 Chapter : Ch 7 Outline
Document Summary
Evidence: lipids and lipid soluble material enter quicker than substances which are insoluble in lipid. Evidence: the phospholipid content of red blood cells is just enough to cover the cell with two layers. The red blood cell has no internal membranes. Evidence: membranes isolated from rbc contain proteins in addition to lipids hydrophobic regions. >>>>>membrane structural models have evolved as new data is acquired. Biochemical detective work: membranes are made of lipid, phospholipids are amphipathic molecules that can form membranes. --amphipathic: condition where a single molecule has both hydrophiliv and: cell membranes are phospholipid bilayers (see fig 7. 2, biological membranes contain proteins, biological membranes are coated with proteins that generally absorb water. Hydrophilic zones = polar head groups + globular proteins. Evidence: biological membranes absorb more water on their surface than. Proteins interact with water put them on surface of phospholipid bilayer. Susceptible to enzymes that break down proteins artificial phospholipid membranes. Singer and nicolson: fluid-mosaic model (see fig 7. 3)
