Exam 2

BIOS102- 250Fall2012SampleSecondExam multipleCHOICE. Choosetheonealternativethatbestcompletesthestatementoranswersthequestion. 1) Whichofthe pastimestatementsdescribesnicotinamide adenine dinucleotide + ? A) Intheabsenceofnicotinamide adenine dinucleotide + ,glycolysis nominatestill pass. B) NAD+ isreducedtoNADHduringglycolysis,pyruvateoxidation,andthecitricacidcycle. C) NAD+ candonateelectronsfor engrossinoxidativephosphorylation. D) NAD+ hasmorechemicalenergythanNADH. E) NAD+ isoxidizedbytheactionofhydrogenases. ) Duringglycolysis,wheneachmoleculeofglucoseiscatabolizedtotwomoleculesofpyruvate, virtuallyofthe potentialenergycontainedinglucoseis A) storedintheNADHproduced. B) transferreddirectlytoadenosine triphosphate. C) transferredtoADP, directingATP. D) retainedinthetwopyruvates. E) usedtophosphorylate laevulosetoformfructose6 phosphate. 3) firstwithonemoleculeofglucose,theenergy containingproductsofglycolysisargon A) 6carbonic acid gas ,30ATP,and2pyruvate. B) 2NAD+ ,2pyruvate ,and2ATP. C) 6 carbon dioxide ,2ATP,and2pyruvate. D) 2FADH2 ,2pyruvate,and4ATP. E) 2NADH,2pyruvate,and2ATP. ) Whyisglycolysisdescribedashavinganinvestmentphaseandapayoffphase? A) ItusesstoredATPandthenformsanetadd-oninATP. B) Itbothsplitsmoleculesandassemblesmolecules. C) Itusesglucoseandgene esteemspyruvate. D) Itattachesanddetachesphosphategroups. E) Itshiftsmoleculesfromcytosoltomitochondrion. 5) Theprimaryroleofoxygenincellularrespirationisto A) accedewithlactate,formingpyruvate. B) yieldenergyintheformofATPasitispasseddowntherespiratorychain. C) actasanacceptorforelectronsandhydrogen,formingwater. D) combinewithcarbon,formingCO 2 .E) catalyzethe replysofglycolysis. 6) Inlivercells,theinnermitochondrialmembranesareaboutfivetimestheareaoftheoutermitochondrial membranes. Whatpurpose essentialthisserve? A) Itincreasesthesurfaceforoxidativephosphorylation. B) Itallowsforanincreased numberofglycolysis. C) Itincreasesthesurfacefor substrate levelphosphorylation. D) Itallowstheliverc ellto pissfewermitochondria. 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 ,andethanol(ethylalcohol). 8) Phosphofructokinaseisanallostericenzymethatcatalyzestheconversionoffructose6 phosphatetofructose 1,6- bisphosphate,anearlystepofglycolysis. Inthe aimofoxygen,anincreaseinthe gistofATPina cellwouldbeexpectedto A) subjugatetheenzymeand thuslyincreasetheratesofglycolysisandthecitricacidcycle. B) activatetheenzymeandthus wispytheratesofglycolysisandthecitricacidcycle. C) inhibittheenzymeandthusslowtheratesofglycolysisandthecitricacidcycle.D) inhibittheenzymeandthusincreasetherateofglycolysisandtheconcentra tionofcitrate. E) activatetheenzymeandincreasetheratesofglycolysisandthecitricacidcycle. 9) Whichoftheeventslistedbelowoccursinthelightreactionsofphotosynthesis? A) Car bondioxideisincorporatedintoPGA. B) NADPisproduced. C) Lightisabsorbedandfunneledtoreaction centerchlorophylla. D) ATPisphosphorylatedtoyieldADP. E) NADPHisreducedtoNADP + . 10) Whichofthe intereststatementsbestdescribestherelationshipbetweenphotosynthesisandrespiration?A) Respirationisanabolicandphotosynthesisiscatabolic. B) ATPmoleculesareproducedinphotosynthesisandusedupinrespiration. C) Photosynthesisstoresenergyincomplexorganicmolecules,whereasrespiration clitorissit. D) Photosynthesisoccurs preciselyinplantsandrespirationoccursonlyin wildcats. E) Respirationrunsthebiochemicalpathwaysofphotosynthesisinreverse. 11) Inthylakoids,protonstravel withATPsynthasefromthethylakoidspacetothestroma. Therefore,the catalytic? knobs? ofATPsynthasewouldbelocated A) ontheATPmoleculesthemselves.B) builtintothecenterofthethylakoidstack(granum). C) onthepigmentmoleculesofphotosystemIandphotosystemII. D) onthestromalsideofthemembrane. E) onthesidefacingthethylakoidspace. 12) Whatistheprimaryfunct ionoftheCalvincycle? A) useATPto supplycarbondioxide B) useNADPHtoreleasecarbondioxide C) synthesizesimplesugarsfromcarbondioxide 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) beginafour- carboncompound,oxaloacetate,whichisthendeliveredtothecitricacidcyclein mitochondria. B) have lasterratesofphotorespiration. C) cancontinuetofixCO 2 evenatrelativelylowCO2 concentrationsandhighoxygenconcentrations. D) growbetterundercool,moistconditions. E) donotuserubiscoforcarbonfixation. 15) TaxolisananticancerdrugextractedfromthePacificyewtree. Inanimalcells,Taxoldisruptsmicrotubule formationbybindingtomicrotubulesandacceleratingtheirassemblyfromtheproteinprecursor,tubulin. Surprisingly,thisstopsmitosis.Specifically,Taxolmust uphold A) theformationofthemitoticspindle. B) theSphaseofthecellcycle. C) form ationofthecentrioles. D) chromatidassembly. E) anaphase. 16) Measurementsoftheamountofdesoxyribonucleic acidpernucleusweretakenonalargenumberofcellsfromagrowing fungus. ThemeasuredDNAlevelsrangedfrom3to6picogramspernucleus. Inwhich stopofthecellcycle didthenucleuscontain6picogramsofDNA? A) G1 B) G0 C) M D) S E) G2 17) Whatisacleavagefurrow? A) aringofvesiclesformingacellplate B) themetaphaseplatewherechromosomesattachtothespindle C) theseparationof dividedprokaryotesD) thespacethatiscreatedbetweentwochromatidsduringanaphase E) agrooveinthe germ plasmmembranebetweendaughternuclei 18) Whichofthefollowingdescribe(s)cyclin- dependentkinase(Cdk)? A) Cdkispresentthroughoutthecellcycleandisanenzymethatattachesphosphategroupstoother proteins. B) Cdkisinactive,or? turnedoff,? inthepresenceofcyclin. C) Cdkisanenzymethatattachesphosphategroupstootherproteins. D) Cdkisinactive,or? turnedoff,? inthepresenceofcyclinanditispresentthroughoutthecellcycle.E) Cdkispresentthroughoutthecellcycle. 3 19) Whydoneuronsandsomeotherspecializedcellsdivideinfrequently? A) Theyno eternalcarryreceptorsforsignalmolecules. B) Theynolongerhaveactivenuclei. C) TheyhavebeenshuntedintoG 0 . D) TheycannolongerbindCdktocyclin. E) TheyshowadropinMPFconcentration. 20) Fora chemotherapeuticdrugtobeusefulfortreatingcancercells,whichofthefollowingismost coveted? A) Itonlyattackscellsthataredensitydependent. B) ItinterfereswithcellsenteringG0 . C) Itinterfereswithrapidlydividingcells.Exam 2