BI110 Lecture : BI 110-Oct 21.docx
Document Summary
Homework: aplia assignment (chapter 5 and 6) oct 28, tutorial assignment due thursday. 2 non polar hydrocarbon tails (fatty acids): hydrophobic, no charge. May be some variation in terms of bonds (double/single)-makes it saturated or unsaturated. 18c0 -18 carbon, 0 double bonds could be the make up(seen in page 2 of slide) Each phospholipid will have same length of tail. When you mix phospholipids in an aqueous solution, they form a bowl shape to exclude h20. Micelle: no interior compartment for h20 to exist. Cell membrane: approximately 10 nm (depending on length of tails) Fluidity of lipid bilayer dependent on how densely individual phospholipid molecules can pack together. Influenced by two major factors: composition of lipid molecules, degree of unsaturation of fatty acid tails. Fig 5. 6, pg96: sterols, temperature of environment. If temp decreases, phosopholipid mol becomes more closely packed, and membrane forms more viscous, semisolid gel. Low temp enzymes and proteins can"t fxn if proper fluidity isn"t maintained.
