Lesson6.pdf

    SCI260–IntroductiontoBiochemistryLesson6

    1. Describe(inwords)theoverallstructureofalipidbilayer.

    2. Whataretheproperties(i.e.,characteristics)ofthelipidbilayerofacellthatmakeitimpermeabletoionsandmostmolecules?

    3. Describetheroleofcholesterolinmaintainingthefluidityofthelipidbilayerofa

    cell?

    4. Thetriglyceridesinanimalstendtobesolids(i.e.,fats)atroomtemperaturewhereasthetriglyceridesinplantstendtobeliquids(i.e.,oils)atroomtemperature.Basedonthisfact,whatcanyouconcludeaboutthecharacteristicsofthefattyacidsinanimaltriglyceridescomparedtothefattyacidsinplanttriglycerides?

    5. Peanutoilcontainsahighpercentageofmonounsaturatedtriglycerideswhereas

    vegetableoilcontainsahigherpercentageofpolyunsaturatedtriacylglycerols.Abottleofpeanutoilandabottleofvegetableoilarestoredinapantrywithanoutsidewall.Duringacoldspell,thepeanutoilfreezes,butthevegetableoilremainsliquid.Explainwhy.

    6. HowmanymoleculesofATParegeneratedwhenstearicacid(i.e.,stearate),an

    18-carbonsaturatedfattyacid,iscompletelyoxidizedviathebeta-oxidationpathwayinthemitochondria?a) 112b) 129c) 146d) 163

    7. Whichofthefollowingfattyacidsbelowareessentialforhumans?*Selectoneor

    more.a) Oleicacidb) Linoleicacidc) Linolenicacidd) Palmitoleicacide) Eicosapentaenoicacid(EPA)

    8. RefertoQuestion7,lookupthestructuresofeachfattyacidthatisessentialandexplainwhytheyareessentialforhumans?

    9. Aretransfattyacidssaturatedorunsaturated?

    10. Providefour(4)examplesoffoodsthatcontaintransfattyacids.Youmayuseyourtextbookand/ortheinternettoassistyou.Youwillearn10pointsforcorrectlyansweringeachquestion(maximumpointsearned=100points).

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