01:119:115 Study Guide - Final Guide: Galactose, Evolutionary Arms Race, Polyphyly
27 Dec 2016
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Cell membrane: forms a closed bilayer vesicle, cylindrical in shape and amphipathic (= comfortable w/ both nonpolar and nonpolar substances/solutions) Fluid mosaic model: held together by hydrophobic interactions, survives only in an aqueous ( = has h2o) environment (cid:498)fluid(cid:499) = cell membrane has the ability to move around and is not rigid, influences: Temperature (cid:498)mosaic(cid:499: has different types of proteins ( membrane proteins = amphipathic [has both polar and nonpolar components]) Fatty acids can be solid or liquid. Made by the human body for the specific reason of fluidity. Orientation: mainly going to be hydrophobic, has a hydroxyl group, which is hydrophilic. Orientated to be found in inner part of cell membrane. Thus, the molecule is orientated in a way where the oh is towards the hydrophilic phospholipid tails. Function: interferes w/ the hydrocarbon chains -> prevent solidification to occur at low temperatures and prevents instability at high temperatures, promotes membrane fluidity.
