11:115:301 Lecture Notes - Lecture 8: Alkane, Lipid Bilayer, Double Bond
22 Sep 2019
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Document Summary
Hiv leaves from an infected cell by budding off the membrane to form a vesicle. Lipids have both hydrophilic + hydrophobic moieties form bilayers. Proteins provide specific functions within the membranes. Fluidity: lipids + proteins diffuse laterally within the membrane do not flip. Change how viscous membrane is by changing length of chains. Given names based on their saturated hydrocarbon: Saturated fa = fa with no double bonds. 18 carbons, 1 double bond 9 carbons away from the carboxyl. Use lower case greek letters to designate positions in fatty acid. The last ch3 is called the omega end no matter what. Delta x (x carbons from carboxy end) Omega x (x carbons from ch3 end) Can make all fa except linoleate + linolenate. Multi-unsaturated are separated by methylene double bonds are not conjugated. Short chain length = lower mp than longer fas. Unsaturations reduce melting points + increase fluidity. Crystalline solid is aided by uniform lattice structure.
