BIOL 2050 Chapter Notes - Chapter 5: Lipid Bilayer, Fluorescence Microscope, Facilitated Diffusion
Document Summary
5. 1 structure of cell ~membranes define spaces in a cell, carry out functions, protect of membranes environment, considered fluid because it can move. ~lipids are main component of cell membranes to form barrier in water. ~proteins are embedded in membrane and help with transportation. ~carbs are in membrane, attached to lipids and proteins. ~hydropho(cid:271)i(cid:272) are (cid:374)o(cid:374)polar a(cid:374)d do(cid:374) t for(cid:373) hydroge(cid:374) (cid:271)o(cid:374)ds. ~amphipathic molecules have both hydrophilic and homophilic less bulky head groups form a bilayer while more bulky head groups form micelles (spherical structures) ~liposomes can form, break, and re-form, grow, weak vanderwal forces allow this. ~cholesterol is also amphipathic with the hydrophilic region being a hydroxyl group, increases or decreases membrane fluidity depending on temperature. ~integral proteins cannot be separated from the membrane, most spread over the entire lipid bilayer with two hydrophilic regions and a hydrophobic region.
