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PCBl 3023l Examl 3l (Latestl 2026/l 2027l Update)l Review|l 100%l Verifiedl Questionsl &l Answersl |l Gradel A
Q:l Duringl photosynthesis,l chargel separationl takesl placel whenl whichl ofl thel followingl
occurs?Choosel one:
A)l Thel speciall pairl passesl anl electronl tol anl electronl carrierl inl thel antennal complex,l leavingl behindl al positivel charge.B)l Thel speciall pairl passesl anl electronl tol anl electronl carrierl inl thel antennal complex,l leavingl behindl al negativel charge.C)l Thel speciall pairl passesl anl electronl tol anl electronl carrierl inl thel reactionl center,l leavingl behindl al negativel charge.D)l Energyl jumpsl randomlyl froml onel chlorophylll moleculel tol anotherl inl thel antennal complex.E)l Lightl energyl isl capturedl byl al chlorophylll moleculel inl thel antennal complex.F)l Thel speciall pairl passesl anl electronl tol anl electronl carrierl inl thel reactionl center,l leavingl behindl al positivel charge.
Answer:
F)l Thel speciall pairl passesl anl electronl tol anl electronl carrierl inl thel reactionl center,l leavingl behindl al positivel charge.
Q:l Whatl isl truel ofl thel antennal complexl ofl al photosystem?Choosel one: A)l Itl convertsl lightl energyl intol chemicall energy.B)l Itl passesl electronsl tol al photosyntheticl electronl transportl chain.C)l Itl extractsl electronsl froml water.D)l Itl capturesl lightl energy.E)l Itl includesl al speciall pairl ofl chlorophylls.
Answer:
D)l Itl capturesl lightl energy.
Q:l Oncel excitedl byl sunlight,l chlorophyllsl inl thel antennal complexl dol whichl ofl thel
following?Choosel one:
A)l releasel thatl energyl asl heat B)l reflectl thel energyl asl light 1 / 4
C)l transferl electronsl tol thel chlorophylll speciall pair D)l transferl thel energyl tol thel chlorophylll speciall pair E)l transferl protonsl tol thel chlorophylll speciall pair
Answer:
D)l transferl thel energyl tol thel chlorophylll speciall pair
Q:l Whatl isl truel ofl stagel 2l ofl photosynthesis?Choosel one: A)l Itl takesl placel inl thel chloroplastl grana.B)l Itl producesl alll ofl thel O2l wel breathe.C)l Itl generatesl al protonl gradientl acrossl thel thylakoidl membrane.D)l Itl producesl glyceraldehydel 3-phosphatel inl thel stroma.E)l Itl beginsl withl thel productionl ofl ATPl andl NADPHl andl endsl withl theirl consumption.
Answer:
D)l Itl producesl glyceraldehydel 3-phosphatel inl thel stroma.
Q:l Inl eukaryoticl cells,l wherel doesl thel conversionl ofl CO2l andl H2Ol tol sugarl takel
place?Choosel one:
A)l mitochondriall matrix B)l chloroplastl stroma C)l thylakoidl membrane D)l plasmal membrane E)l cytosol
Answer:
B)l chloroplastl stroma
Q:l Photosynthesisl allowsl plantsl tol capturel energyl froml sunlightl tol producel
what?Choosel one:
A)l H2O B)l NADH C)l chlorophyll D)l CO2 E)l sugars
Answer:
E)l sugars
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Q:l Inl chloroplasts,l thel pigmentl chlorophylll donatesl electronsl tol anl electron-transportl
chainl inl whichl cellularl compartment?Choosel one:
A)l mitochondriall innerl membrane B)l thylakoidl membrane C)l innerl membranel ofl thel chloroplastl envelope D)l plasmal membrane E)l stroma
Answer:
B)l thylakoidl membrane
Q:l Chlorophylll moleculesl absorbl whichl colorl ofl lightl mostl strongly?Choosel one: A)l red B)l green C)l black D)l white E)l UV
Answer:
A)l red
Q:l Duringl Earth'sl history,l withl thel risel ofl cyanobacteria,l whatl moleculel beganl
accumulatingl inl thel atmospherel forl thel firstl time?Choosel one:
A)l H2O B)l CO2 C)l O2 D)l N2
Answer:
C)l O2
Q:l Whatl electronl acceptorl allowsl anl organisml tol completelyl breakl downl organicl moleculesl intol CO2l andl H2Ol andl therebyl releasel al largel amountl ofl energyl thatl canl
bel harnessedl byl thel celll tol dol work?Choosel one:
A)l NADH B)l pyruvate C)l H2O D)l O2 3 / 4
E)l H2S
Answer:
D)l O2
Q:l Whatl isl truel ofl nitrogenl fixation?Choosel one: A)l Itl promotedl thel evolutionl ofl ancientl cellsl byl allowingl theml tol convertl N2l tol NO2l nearl thermall vents.B)l Itl reducesl N2l tol ammonial (NH3).C)l Itl canl bel usedl tol generatel anl H+l gradient.D)l Itl convertsl CO2l andl H2Ol intol sugars.E)l Itl requiresl al smalll energyl inputl andl isl thusl energeticallyl favorable.
Answer:
B)l Itl reducesl N2l tol ammonial (NH3).
Q:l Shownl herel isl thel mechanisml believedl tol bel usedl forl pumpingl protonsl byl cytochromel cl oxidasel acrossl thel innerl mitochondriall membrane.l Onel ofl thel stepsl shownl isl unidirectionall becausel itl isl drivenl byl thel energyl ofl electronl transport.l Whyl
mustl thisl stepl bel performedl onlyl inl onel direction?Choosel one:
A.l Thel protonsl couldl bel alsol capturedl froml thel intermembranel spacel andl releasedl backl intol thel matrix.B.l Thel innerl membranel wouldl becomel porousl tol alll molecules.C.l Thel complexl wouldl stayl stuckl inl thel closedl (centerl conformation).D.l Thel H+l affinityl inl thel twol conformationsl wouldl reverse.
Answer:
A.l Thel protonsl couldl bel alsol capturedl froml thel intermembranel spacel andl releasedl backl intol thel matrix.
Q:l Inl oxidativel phosphorylationl inl mitochondria,l high-energyl electronsl arel transferredl tol thel electron-transportl chainl froml activatedl carriersl likel NADH.l Stagel 1l ofl photosynthesisl alsol usesl anl electron-transportl chainl tol pumpl protonsl andl makel ATP.l Inl
thisl case,l wherel dol thel high-energyl electronsl comel from?Choosel one:
A.l NADPH B.l chlorophyll C.l FADH2 D.l ADP
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