BIOCHEMISTRY II CHAPTER 9 LIPIDS PRACTICE QUESTIONS/MC QUESTIONS AND CORRECT ANSWERS

BIOCHEMISTRY II CHAPTER 9 LIPIDS
PRACTICE QUESTIONS/MC QUESTIONS
AND CORRECT ANSWERS
DA2-A2Ans--WhyA2areA2fattyA2acidsA2amphiphilicA2molecules?
A.A2TheyA2haveA2bothA2(+)A2andA2(-)A2charges.
B.A2TheyA2containA2saturatedA2andA2unsaturatedA2groups.
C.A2TheyA2areA2water-soluble.
D.A2TheyA2haveA2polarA2headsA2andA2non-polarA2tails.
E.A2TheyA2areA2unbranched.

cA2-A2Ans--
WhichA2ofA2theA2followingA2classesA2ofA2proteinsA2associatesA2withA2theA2membraneA2bila
yerA2withA2theA2lowestA2energyA2andA2wouldA2thereforeA2beA2mostA2difficultA2toA2separateA
2fromA2theA2membrane?A2


A)A2extrinsicA2proteins
B)A2lipid-linkedA2proteins
C)A2transmembraneA2proteins
D)A2peripheralA2proteins
E)A2hydrophilicA2proteins

BA2-A2Ans--2.A2SaturatedA2fattyA2acidsA2haveA2C-
CA2singleA2bondsA2andA2unsaturatedA2fattyA2acidsA2haveA2oneA2orA2moreA2unsequentialA2
C=CA2doubleA2bondsA2inA2cisA2configuration.A2SaturatedA2fattyA2acidsA2areA2waxyA2solidsA
2atA2roomA2temperatureA2whileA2unsaturatedA2fattyA2acidsA2areA2oilyA2liquids.A2ThisA2isA2be
cause:
A.A2UnsaturatedA2fattyA2acidsA2formA2saltsA2butA2saturatedA2fattyA2acidsA2cannot.
B.A2SaturatedA2fattyA2acidsA2packA2togetherA2toA2formA2solidsA2butA2unsaturatedA2fattyA2ac
idsA2cannotA2becauseA2theA2cisA2C=CA2doubleA2bondsA2formA2kinks.
A2C.A2C=CA2doubleA2bondsA2inA2unsaturatedA2fattyA2acidsA2formA2HA2bondsA2withA2otherA2
unsaturatedA2fattyA2acids.
D.A2UnsaturatedA2fattyA2acidsA2formA2micellesA2butA2saturatedA2fattyA2acidsA2doA2not.

dA2-A2Ans--
TriacylglycerolsA2areA2aA2cellularA2metabolicA2fuel.A2WhichA2ofA2theA2followingA2areA2trueA2
ofA2triacylglycerols?
A2A.A2TheyA2areA2polar,A2hydrophobicA2molecules.
B.A2MostA2triacylglycerolsA2haveA2threeA2fattyA2acidA2groupsA2thatA2areA2identical.
C.A2TheyA2shouldA2beA2completelyA2eliminatedA2fromA2theA2humanA2diet.
A2D.A2TriacylglycerolsA2fromA2animalsA2areA2solidsA2atA2roomA2temperatureA2whileA2thoseA
2fromA2plantsA2areA2liquid.

,BA2-A2Ans--TheA2C=CA2bondA2inA2fattyA2acids:
A2A.A2IsA2inert
A2B.A2IsA2subjectA2toA2autooxidation
C.A2ReactsA2withA2NaOHA2toA2formA2lye
A2D.A2CannotA2beA2convertedA2fromA2cisA2toA2transA2configuration


CA2-A2Ans--
AdipocytesA2areA2fatA2storageA2cellsA2inA2animals.A2TheseA2cellsA2containA2theA2enzymeA2l
ipase,A2whichA2catalyzesA2theA2releaseA2ofA2fattyA2acids.
A2
ThisA2reactionA2isA2called:
A2A.A2Esterification
A2B.A2Saponification
C.A2Hydrolysis
A2D.A2Hydrogenation


B,A2G,A2S,A2G,A2G,A2SA2-A2Ans--
DesignateA2eachA2groupA2belowA2asA2aA2possibleA2constituentA2ofA2theA2glycerophospholi
pidsA2(G)A2orA2sphingolipidsA2(S)A2orA2bothA2(B)A2byA2enteringA2G,A2S,A2orA2BA2inA2eachA2bl
ank.
___A2H
___A2Serine
___A2Glucose
___A2Inositol
___A2Choline
___A2Phosphocholine

DA2-A2Ans--7.A2AllA2ofA2theA2followingA2areA2trueA2ofA2cholesterolA2except:
A2A.A2ItA2attachesA2toA2glycerophospholipidsA2andA2sphingolipidsA2inA2membranes.
A2B.A2ItA2isA2transportedA2throughA2theA2bloodA2byA2lipoproteins.
C.A2ItA2isA2derivedA2fromA2isoprene.
D.A2ItA2isA2foundA2inA2bothA2plantA2andA2animalA2tissue.
A2E.A2ItA2isA2aA2buildingA2blockA2forA2hormones.
A2F.A2ItA2isA2aA2buildingA2blockA2ofA2bileA2salts.


A2 Incorrect,A2cholesterolA2isA2derivedA2fromA2isoprene.

B,A2A,A2E,A2G,A2C,A2F,A2DA2-A2Ans--
8.A2LabelA2theA2partsA2ofA2theA2membraneA2byA2enteringA2theA2letterA2ofA2theA2partA2show
nA2inA2theA2schematicA2below:
A2
___A2LipidA2tail
___A2PolarA2head
___A2PeripheralA2membraneA2protein
___A2Carbohydrate
___A2LipidA2bilayer
___A2Cholesterol

, ___A2IntegralA2membraneA2protein

AA2-A2Ans--MembranesA2serveA2asA2aA2selectiveA2barrierA2forA2theA2cell.A2Small,A2non-
polarA2moleculesA2suchA2asA2H2OA2goA2throughA2theA2membraneA2viaA2simpleA2diffusion.
A2FacilitatedA2diffusionA2isA2aA2protein-
mediatedA2processA2whereinA2particularA2integralA2membraneA2proteins,A2calledA2permea
ses,A2formA2channelsA2forA2certainA2molecules.A2InA2whatA2waysA2areA2permeasesA2simila
rA2toA2enzymes?
A2A.A2TheyA2obeyA2Michaelis-MentenA2kinetics
A2B.A2TheyA2lowerA2activationA2energy.
A2C.A2TheyA2areA2nonspecificA2forA2manyA2typesA2ofA2molecules.
A2D.A2TheyA2catalyzeA2reverseA2reactions.


CA2-A2Ans--TheA2levelsA2ofA2Na+A2andA2K+A2inA2aA2cellA2areA2maintainedA2byA2theA2Na+-
K+A2ATPaseA2pump.A2ThisA2isA2anA2exampleA2ofA2activeA2transportA2acrossA2aA2membran
e.A2ThisA2pump:
A2A.A2CreatesA2ATP
A2B.A2PumpsA2K+A2andA2Na+A2in
A2C.A2IsA2anA2exampleA2ofA2antiport.
A2D.A2RequiresA2lightA2absorption


DA2-A2Ans--PhospholipidsA2areA2moleculesA2thatA2contain:
A.A2positivelyA2chargedA2functionalA2groups.
B.A2longA2water-solubleA2carbonA2chains.
C.A2cholesterol.
D.A2hydrophilicA2headsA2andA2hydrophobicA2tails.
E.A2TheA2thirdA2andA2fourthA2answersA2areA2bothA2correct.

EA2-A2Ans--
MicellesA2ofA2fattyA2acidsA2inA2waterA2areA2organizedA2suchA2thatA2theA2___A2faceA2theA2so
lventA2andA2theA2___A2areA2directedA2towardA2theA2interior.
A.A2hydrophilicA2heads;A2hydrophobicA2tails
B.A2carboxylicA2acidA2groups;A2hydrocarbonA2chains
C.A2hydrocarbonA2chains;A2carboxylicA2acidA2groups
D.A2hydrophobicA2tails;A2hydrophilicA2heads
E.A2TheA2firstA2andA2secondA2answersA2areA2bothA2correct.

EA2-A2Ans--
TheA2glycerophospholipidsA2areA2composedA2ofA2twoA2fattyA2acidsA2attachedA2toA2glycerol
A2andA2oneA2ofA2theA2followingA2headA2groups:
A.A2ethanolamine.
B.A2choline.
C.A2serine.
D.A2threonine.
E.A2AllA2butA2theA2fourthA2choiceA2areA2correct.