SCI260 IntroductiontoBiochemistry Lesson6 1. Describe(inwords)theoverallstructureofalipidbilayer. 2. Whataretheproperties(i.e.,characteristics) ofthelipidbilayer ofacellthat make itimpermeable to ionsandmostmolecules? 3. Describe theroleofcholesterolinmaintainingthefluidityofthelipidbilayerofa cell? 4. Thetriglyceridesin animalstendtobesolids(i.e.,fats)atroomtemperature whereas thetriglyceridesinplantstendtobeliquids(i.e.,oils)atroom temperature.Basedonthisfact,whatcanyouconcludeaboutthecharacteristics ofthefattyacids inanimaltriglyceridescomparedtothefattyacidsinplant triglycerides? 5. Peanutoilcontainsahighpercentageofmonounsaturatedtriglycerideswhereas vegetableoilcontainsahigherpercentageofpolyunsaturatedtriacylglycerols.A bottleofpeanutoilandabottleofvegetableoilarestoredinapantrywithan outsidewall.Duringacoldspell,thepeanutoilfreezes, butthevegetableoil remainsliquid.Explainwhy. 6. HowmanymoleculesofATParegeneratedwhenstearicacid(i.e.,stearate),an 18-carbonsaturatedfattyacid,is completelyoxidizedviathebeta-oxidation pathwayinthemitochondria? a) 112 b) 129 c) 146 d) 163 7. Whichofthefollowingfattyacidsbelowareessentialforhumans? *Selectoneor more. a) Oleicacid b) Linoleicacid c) Linolenicacid d) Palmitoleicacid e) Eicosapentaenoicacid(EPA) 8. RefertoQuestion7,lookupthestructuresofeachfattyacidthatisessentialand explainwhytheyareessential for humans? 9. Aretransfattyacids saturatedorunsaturated? 10.Providefour(4) examples offoodsthatcontain transfattyacids. Youmayuseyourtextbookand/ortheinternettoassistyou.Youwillearn10points for correctlyansweringeachquestion(maximumpointsearned=100points).
