Exam 2

BIOS102- 250Fall2012SampleSecond testing MULTIPLECHOICE. Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. 1) Whichofthe following(a)statementsdescribesnicotinamide adenine dinucleotide + ? A) IntheabsenceofNAD + ,glycolysis bungholestill billet. B) NAD+ isreducedtoNADHduringglycolysis,pyruvateoxidation,andthecitric cuttingcycle. C) NAD+ candonateelectronsforuseinoxidativephosphorylation. D) NAD+ hasmorechemicalenergythanNADH. E) NAD+ is oxidatebytheactionofhydrogenases. ) Duringglycolysis,wheneachmoleculeofglucoseiscatabolizedtotwomoleculesofpyruvate,mostofthe potentialenergycontainedinglucoseis A) storedintheNADHproduced. B) transferreddirectlytoadenosine triphosphate. C) transferredtoADP,formingadenosine triphosphate. D) retainedinthetwopyruvates. E) usedtophosphorylatefructosetoformfructose6 phosphate. 3) beginningwithonemoleculeofglucose,theenergy containingproductsofglycolysisare A) 6CO2 ,30ATP,and2pyruvate. B) 2NAD+ ,2pyruvate,and2ATP. C) 6CO2 ,2ATP, and2pyruvate. D) 2FADH2 ,2pyruvate,and4ATP. E) 2NADH,2pyruvate,and2ATP. ) Whyisglycolysisdescribedashavinganinvestment levelandapayoffphase? A) ItusesstoredATPandthenformsanet growinginATP. B) Itbothsplitsmoleculesandassemblesmolecules. C) Itusesglucoseandgene pasturespyruvate. D) Itattachesanddetachesphosphategroups. E) Itshiftsmoleculesfromcytosoltomitochondrion. 5) Theprimary constituentof atomic number 8in cubicleularrespirationisto A) combinewithlactate,formingpyruvate. B) yieldenergyintheformofATPasitispasseddowntherespiratorychain. C) actasanacceptorforelectronsandhydrogen,formingwater. D) combinewith hundred,formingCO 2 .E) catalyzethereactionsofglycolysis. 6) Inlivercells,theinnermitochondrial membranesareaboutfivetimestheareaoftheoutermitochondrial membranes. Whatpurpose essentialthisserve? A) Itincreasesthesurfaceforoxidativephosphorylation. B) Itallowsforanincreasedrateofglycolysis. C) Itincreasesthesurfaceforsubstrate levelphosphorylation. D) Itallowsthelivercelltohave fewermitochondria. E) Itallowsforanincreasedrateofthecitricacidcycle. 1 7) Intheabsenceofoxygen,yeastcellscanobtainenergybyfermentation,resultingintheproductionof A) ATP,pyruvate,andacetylCoA.B) ATP,CO2 ,andlactate. C) ATP,NADH,andpyruvate. D) ATP,pyruvate,andoxygen. E) ATP,CO2 ,and ethanol(ethylalcohol). 8) Phosphofructokinaseisanallostericenzymethatcatalyzestheconversionoffructose6 phosphatetofructose 1,6- bisphosphate,anearlystepofglycolysis. Inthe chargeofoxygen,anincreaseintheamountofATPina cellwouldbeexpectedto A) inhibittheenzymeand indeedincreasetheratesofglycolysisandthecitricacidcycle. B) activatetheenzymeandthusslowtheratesofglycolysisandthecitricacidcycle. C) inhibittheenzymeandthusslowtheratesofglycolysisandthecitricacidcycle.D) inhibittheenzymeandthusincreasetherateofglycolysisandtheconcentra tionofcitrate. E) activatetheenzymeandincreasetheratesofglycolysisandthecitricacidcycle. 9) Whichoftheeventslistedbelowoccursinthelightreactionsofphotosynthesis? A) Carbondioxide is co-ordinatedintoPGA. B) nicotinamide adenine dinucleotide phosphateisproduced. C) Lightisabsorbedandfunneledtoreaction centerchlorophylla. D) ATPisphosphorylatedtoyieldADP. E) NADPHisreducedtoNADP + . 10) Whichofthefollowingstatementsbestdescribestherelationshipbetweenphotosynthesisandrespiration?A) Respirationisanabolicandphotosynthesisiscatabolic. B) ATPmoleculesareproducedinphotosynthesisandusedupinrespiration. C) Photosynthesisstoresenergyincomplexorganicmolecules,whereasrespirationreleasesit. D) Photosynthesisoccursonlyinplantsandrespirationoccursonlyinanimals. E) Respirationrunsthebiochemicalpathwaysofphotosynthesisinreverse. 11) Inthylakoids,protonstravelthroughATPsynthasefromthethylakoidspacetothestroma. Therefore,the catalytic? knobs? ofATPsynthasewouldbelocated A) ontheATPmoleculesthemselves.B) builtintothecenterofthethylakoid plenteousness(granum). C) onthepigmentmoleculesofphotosystemIandphotosystemII. D) onthestromalsideofthemembrane. E) onthesidefacingthethylakoids pace. 12) WhatistheprimaryfunctionoftheCalvincycle? A) useATPtoreleasecarbondioxide B) useNADPHtoreleasecarbondioxide C) synthesize elementarysugarsfromcarbondioxide D) splitwaterandreleaseoxygen E) transportRuBPoutofthechloroplast 2 13) PhotorespirationoccurswhenrubiscoreactsRuBPwith A) 3 phosphoglycerate. B) CO 2 . C) O2 . D) glyceraldehyde3 phosphate. E) NADPH. 4) ComparedtoC 3 plants,C 4 plants A) makeafour- carboncompound,oxaloacetate,whichisthendeliveredtothecitricacidcyclein mitochondria. B) havehigherratesofphotorespiration. C) can keep backtofixCO 2 evenatrelativelylowCO2 concentrationsandhighoxygenconcentrations. D) growbetterundercool,moistconditions. E) donotuserubiscoforcarbonfixation. 15) Taxolisananticancer drugextractedfromthePacificyewtree. Inanimalcells,Taxoldisruptsmicrotubule formationbybindingtomicrotubulesandacceleratingtheirassemblyfromtheproteinprecursor,tubulin. Surprisingly,thisstopsmitosis.Specifically,Taxolmust partake A) theformationofthemitotic capitu lum. B) theSphaseofthecellcycle. C) formationofthecentrioles. D) chromatidassembly. E) anaphase. 16) MeasurementsoftheamountofDNApernucleusweretakenonalargenumberofcellsfromagrowing fungus. ThemeasuredDNAlevelsrangedfrom3to6picogramspernucleus. Inwhichstageofthecellcycle didthenucleuscontain6picogramsofDNA? A) G1 B) G0 C) M D) S E) G2 17) Whatisacleavagefurrow? A) aringofvesiclesformingacellplate B) themetaphaseplatewherechromo just aboutsattachtothespindle C) theseparationofdividedprokaryotesD) thespacethatiscreatedbetweentwochromatidsduringanaphase E) agrooveintheplasmamembranebetweendaughternuclei 18) Whichofthefollowingdescribe(s)cyclin- dependentkinase(Cdk)? A) Cdkispresentthroughoutthecellcycleandisanenzymethatattachesphosphategroupsto opposite proteins. B) Cdkisinactive,or? turnedoff,? inthepresenceofcyclin. C) Cdkisanenzymethatattachesphosphategroupstootherproteins. D) Cdkisinactive,or? turnedoff,? inthepresenceofcyclinanditispresentthroughoutthecellcycle.E) Cdkispresentthro ughoutthecellcycle. 3 19) Whydoneuronsandsomeotherspecializedcellsdivideinfrequently? A) Theyno seven-daycarryreceptorsforsignalmolecules. B) Theynolongerhaveactivenuclei. C) TheyhavebeenshuntedintoG 0 . D) TheycannolongerbindCdktocyclin. E) They argueadropinMPFconcentration. 20) Forachemotherapeuticdrugtobeusefulfortreatingcancercells,whichofthefollowingismostdesirable? A) Itonlyattackscellsthataredensitydependent. B) ItinterfereswithcellsenteringG0 . C) Itinterfereswithrapidlydividingcells.Exam 2