90 + Interview Questions in Oxidative Phosphorylation and Photophosphorylation in Biochemistry Page 2 InterviewSolution

51.	Oxysomes or F0 – F1 particles occur on _____________(a) Inner mitochondrial membrane(b) Chloroplast surface(c) Mitochondrial surface(d) ThylakoidsI got this question in homework.Enquiry is from Mitochondrial Genes: Their Origin and the Effects of Mutations in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right CHOICE is (a) Inner mitochondrial membrane To elaborate: OXYSOMES which are also called as F0 – F1 PARTICLES are present on the surface of the folded inner mitochondrial membrane.

Discussion

52.	What is the proportion of ATP produced by oxidative phosphorylation?(a) 60%(b) 70%(c) 80%(d) 90%This question was posed to me in examination.This interesting question is from Regulation of Oxidative Phosphorylation in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right choice is (a) 60% The best EXPLANATION: About 60% of ATP produced by OXIDATIVE PHOSPHORYLATION.

Discussion

53.	Complex 2 is also called _________(a) NADH dehydrogenase(b) Succinate dehydrogenase(c) Cytochrome bc1 complex(d) Cytochrome oxidaseThis question was posed to me in my homework.I would like to ask this question from Electron-Transfer reactions in Mitochondria in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right OPTION is (b) Succinate dehydrogenase To explain: COMPLEX 1 is CALLED NADH dehydrogenase. Complex 3 is called the cytochrome bc1 complex. Complex 4 is called cytochrome oxidase.

Discussion

54.	Which of the following systems has an associated water splitting activity resembling that of plants?(a) Photosystem(b) Photosystem I(c) Photosystem II(d) Photosystem IIII had been asked this question during an interview.My query is from ATP Synthesis by Photophosphorylation in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct option is (C) Photosystem II The best I can explain: Photosystem II has an ASSOCIATED water splitting activity resembling that of PLANTS.

Discussion

55.	A water-soluble protein that carries one electron present in the chloroplast is ____________(a) PQB(b) Q(c) Cytochrome c(d) PlastocyaninI had been asked this question in an international level competition.My doubt stems from The Central Photochemical Event : Light-Driven Electron Flow topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct option is (d) Plastocyanin The EXPLANATION: PQB and Q are lipid-soluble PROTEIN; cytochrome C is PRESENT in mitochondria.

Discussion

56.	Plastoquinol formed in PSII is oxidized by ____________(a) Cytochrome b6f(b) Cytochrome c(c) Cytochrome f(d) Cytochrome hI have been asked this question in exam.Question is from The Central Photochemical Event : Light-Driven Electron Flow topic in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT answer is (a) Cytochrome b6f The explanation: PLASTOQUINOL formed in PSII is oxidized by cytochrome b6f complex.

Discussion

57.	Which one of the following is true about C4 plants?(a) They minimize rubisco oxygenase activity by fixing CO2 into oxaloacetate(b) They mainly occur in areas of high temperature and light intensity(c) They minimize the rubisco oxygenase activity by fixing CO2 into phosphoenolpyruvic acid(d) C3 plants are more efficient in photosynthesis than C4 plantsThis question was addressed to me in an international level competition.My doubt is from The Role of Mitochondria in Apoptosis and Oxidative Stress topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct OPTION is (a) They minimize rubisco OXYGENASE ACTIVITY by fixing CO2 into oxaloacetate Explanation: C4 plants are more efficient in PHOTOSYNTHESIS than C3 plants.

Discussion

58.	Oxidative stress (in humans) is not involved in the development of ____________(a) Cancer(b) Parkinson’s disease(c) Heart failure(d) Kidney failureThis question was addressed to me in a job interview.Enquiry is from The Role of Mitochondria in Apoptosis and Oxidative Stress topic in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT option is (d) Kidney failure The EXPLANATION is: In humans oxidative stress is involved in the development of CANCER, parkinson’s disease and HEART failure.

Discussion

59.	A mobile, lipid soluble carrier of two electrons present in chloroplasts is ____________(a) PQB(b) Q(c) Cytochrome c(d) PlastocyaninThe question was asked during an interview.The query is from The Central Photochemical Event : Light-Driven Electron Flow in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» RIGHT choice is (a) PQB To explain I would say: Q is PRESENT in mitochondria; CYTOCHROME C and PLASTOCYANIN are water-soluble protein that carries one electron.

Discussion

60.	A mobile, lipid soluble carrier of two electrons present in mitochondria is ____________(a) PQB(b) Q(c) Cytochrome c(d) PlastocyaninI have been asked this question in an interview for internship.I need to ask this question from The Central Photochemical Event : Light-Driven Electron Flow in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right choice is (B) Q Best EXPLANATION: PQB is present in chloroplasts; cytochrome c and plastocyanin are water-soluble PROTEIN that CARRIES one electron.

Discussion

61.	A soluble Cu-containing electron transfer protein is ____________(a) Pheophytin(b) Cytochrome c(c) Plastocyanin(d) FerredoxinThe question was posed to me in an interview for internship.My doubt is from The Central Photochemical Event : Light-Driven Electron Flow topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» RIGHT OPTION is (C) Plastocyanin Best explanation: Plastocyanin is a soluble Cu-containing electron TRANSFER protein.

Discussion

62.	If the oxidative phosphorylation was uncoupled in the mitochondria then there is a/an ____________(a) Decreased concentration of ADP in the mitochondria(b) Decreased oxidative rate(c) Increased inorganic phosphate in the mitochondria(d) Decreased production of heatThe question was posed to me by my school teacher while I was bunking the class.This intriguing question originated from ATP Synthesis-1 in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right answer is (C) Increased INORGANIC phosphate in the MITOCHONDRIA Easiest explanation: If the OXIDATIVE phosphorylation was UNCOUPLED in the mitochondria then there is an increased inorganic phosphate in the mitochondria.

Discussion

63.	Which of the following group of plants contains agranal chloroplast?(a) C3 plants(b) C4 plants(c) C2 plants(d) C1 plantsThe question was asked in examination.I need to ask this question from The Role of Mitochondria in Apoptosis and Oxidative Stress in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct OPTION is (B) C4 PLANTS The explanation is: C4 plants CONTAINS agranal chloroplast.

Discussion

64.	Complex 4 is also called _________(a) NADH dehydrogenase(b) Succinate dehydrogenase(c) Cytochrome bc1 complex(d) Cytochrome oxidaseThis question was posed to me in unit test.I'd like to ask this question from Electron-Transfer reactions in Mitochondria topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct answer is (d) Cytochrome oxidase Easy explanation: Complex 1 is CALLED NADH dehydrogenase. Complex 3 is called the cytochrome bc1 complex. Complex 2 is called succinate dehydrogenase.

Discussion

65.	Which of the following is the distinguishable feature of cyclic photophosphorylation?(a) Phosphorylation only takes place(b) Phosphorylation and photolysis take place(c) Photolysis of water is taking place(d) None of the mentionedI have been asked this question in a job interview.Question is taken from The Role of Mitochondria in Apoptosis and Oxidative Stress in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct option is (a) PHOSPHORYLATION only TAKES PLACE The best explanation: Only phosphorylation takes place in cyclic phosphorylation.

Discussion

66.	What is the effect of the excessive rate of apoptosis?(a) Atrophy(b) Sneezing(c) Fever(d) AIDSI have been asked this question in examination.My question is from The Role of Mitochondria in Apoptosis and Oxidative Stress in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct OPTION is (a) Atrophy Explanation: EXCESSIVE apoptosis causes atrophy, whereas its DEFICIENT AMOUNT leads to UNCONTROLLED cell proliferation.

Discussion

67.	Typically how many copies of DNA is/are there in each mitochondrion?(a) 1(b) 11(c) 10(d) 12This question was addressed to me in final exam.This key question is from Mitochondrial Genes: Their Origin and the Effects of Mutations topic in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» RIGHT OPTION is (c) 10 Explanation: Typically 2-10 copies of DNA are there in each MITOCHONDRION.

Discussion

68.	Products of glucose oxidation essential for oxidative phosphorylation are ____________(a) Pyruvate(b) Acetyl co-A(c) NADPH and ATP(d) NADH and FADH2I got this question during an internship interview.This interesting question is from Regulation of Oxidative Phosphorylation in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct CHOICE is (d) NADH and FADH2 To elaborate: The end PRODUCTS of Krebs cycle are CO2, NADH, FADH2, ATP and water. The reactants of OXIDATIVE phosphorylation are NADH, FADH2, O2, ADP and P.

Discussion

69.	Every cycle of β-oxidation produces ____________(a) 1 FAD, 1 NAD^+ and 2 CO2 molecules(b) 1 FADH2, 1 NADH and 1 acetyl co-A(c) 1 FADH2, 1 NAD^+ and 1 acetyl co-A(d) 1 FAD, 1 NADH and 2 CO2 moleculesThis question was addressed to me in unit test.My question is based upon ATP Synthesis topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT option is (b) 1 FADH2, 1 NADH and 1 acetyl co-A Best EXPLANATION: Every CYCLE of β-oxidation produces 1 FADH2, 1 NADH and 1 acetyl co-A.

Discussion

70.	Which of the following takes place in substrate level phosphorylation?(a) Oxidation of one molecule of substrate is linked to synthesis of more than one ATP molecule(b) High energy intermediate compounds cannot be isolated(c) Only mitochondrial reactions participate in ATP formation(d) Substrate reacts to form a product containing a high energy bondI have been asked this question in an interview for internship.I'm obligated to ask this question of ATP Synthesis-1 topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct OPTION is (d) Substrate REACTS to form a product containing a HIGH energy bond To EXPLAIN: Substrate reacts to form a product containing a high energy bond.

Discussion

71.	When compared to retinal, chlorophyll can be described as a pigment that has a ____________(a) Narrow absorption range but high efficiency(b) Narrow absorption range but low efficiency(c) Wide absorption range but high efficiency(d) Wide absorption range but low efficiencyI had been asked this question in my homework.My doubt stems from ATP Synthesis by Photophosphorylation in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT option is (a) Narrow absorption range but HIGH EFFICIENCY To EXPLAIN: Chlorophyll has a narrow absorption range but high efficiency compared to RETINAL.

Discussion

72.	Cyanobacteria does not use which of the following for both oxidative and photophosphorylation?(a) Cytochrome c6(b) Cytochrome b6f(c) Plastoquinone(d) PlastocyaninThe question was asked by my college professor while I was bunking the class.I'd like to ask this question from The Central Photochemical Event : Light-Driven Electron Flow topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT choice is (d) Plastocyanin The EXPLANATION: CYANOBACTERIA USE cytochrome c6, cytochrome b6f and plastoquinone for both OXIDATIVE and photophosphorylation.

Discussion

73.	A chlorophyll-like accessory pigment lacking Mg^+2 is ____________(a) Pheophytin(b) Cytochrome c(c) Plastocyanin(d) FerredoxinThis question was addressed to me during an interview.This is a very interesting question from The Central Photochemical Event : Light-Driven Electron Flow in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT option is (a) Pheophytin The BEST explanation: Pheophytin is a chlorophyll-like ACCESSORY PIGMENT LACKING Mg^+2.

Discussion

74.	Light energy is converted to chemical energy in the presence of ____________(a) Chloroplast(b) Ribosomes(c) Mitochondria(d) StomataThis question was posed to me in homework.The question is from General Features of Photophosphorylation in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct answer is (a) Chloroplast Explanation: PHOTOSYNTHETIC pigment chlorophyll captures the ENERGY from SUNLIGHT and converts it and stores it in energy-storage MOLECULES ATP and NADPH.

Discussion

75.	Calvin cycle occurs in ____________(a) Cytoplasm(b) Chloroplast(c) Mitochondria(d) Golgi bodyThe question was posed to me by my college professor while I was bunking the class.This interesting question is from General Features of Photophosphorylation topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT OPTION is (a) Cytoplasm Best explanation: CALVIN cycle OCCURS in cytoplasm.

Discussion

76.	Hydrogen is transferred from the light reaction to the dark reaction in photosynthesis by _____________(a) DPN(b) NAD(c) ATP(d) NADPI had been asked this question in an international level competition.The query is from General Features of Photophosphorylation topic in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct ANSWER is (a) DPN For EXPLANATION I would say: Diphosphopyridine nucleotide TRANSFERS hydrogen from the LIGHT reaction to the dark reaction in PHOTOSYNTHESIS.

Discussion

77.	What is the rate of apoptosis in average human adult per day?(a) 10 billion cells(b) 30 billion cells(c) 50-70 billion cells(d) 100 billion cellsThe question was posed to me at a job interview.This interesting question is from The Role of Mitochondria in Apoptosis and Oxidative Stress in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct choice is (c) 50-70 billion CELLS To ELABORATE: The rate of apoptosis in AVERAGE HUMAN adult PER day is 50-70 billion cells.

Discussion

78.	How many human mitochondrial proteins are encoded in the mitochondrial genome and synthesized within mitochondria?(a) 11(b) 12(c) 13(d) 14I have been asked this question in final exam.My question is from Mitochondrial Genes: Their Origin and the Effects of Mutations in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct option is (C) 13 The best I can explain: 13 human MITOCHONDRIAL proteins are ENCODED in the mitochondrial genome and SYNTHESIZED within mitochondria.

Discussion

79.	The magnitude of proton motive force depends on ____________(a) Energy charge of cell(b) Permeability of membrane(c) Number of ribosomes in cell(d) None of the mentionedThis question was addressed to me in my homework.The above asked question is from Regulation of Oxidative Phosphorylation in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct ANSWER is (a) Energy CHARGE of cell The BEST EXPLANATION: The magnitude of proton motive FORCE depends on energy charge of cell.

Discussion

80.	Which of the following accepts only one electron?(a) Cytochrome b(b) Coenzyme Q(c) FMN(d) FADThe question was posed to me in quiz.Asked question is from ATP Synthesis-1 topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT choice is (a) Cytochrome B Easiest EXPLANATION: Cytochrome b accepts only ONE electron.

Discussion

81.	In mitochondria, hydride ions are removed from substrates by _________(a) NAD-linked dehydrogenases(b) NADP-linked dehydrogenases(c) ATP synthase(d) Succinate dehydrogenasesThis question was posed to me during an online interview.My doubt stems from Electron-Transfer reactions in Mitochondria in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» RIGHT CHOICE is (a) NAD-linked dehydrogenases The best EXPLANATION: In CYTOSOL hydride ions are removed from substrates by NADP-linked dehydrogenases.

Discussion

82.	Photosynthesis takes place in sac like membranes called ___________(a) Thylakoids(b) Grana(c) Photosystems(d) PhotonsThis question was addressed to me in an online quiz.I would like to ask this question from ATP Synthesis by Photophosphorylation topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct choice is (a) Thylakoids The EXPLANATION is: Photosynthesis takes PLACE in THYLAKOID STRUCTURES.

Discussion

83.	The percentage of light energy fixed in photosynthesis is around ____________(a) 100%(b) 10%(c) 1%(d) 0.1%This question was posed to me during an interview.Asked question is from General Features of Photophosphorylation topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct OPTION is (C) 1% The best explanation: Around 1% of LIGHT energy is FIXED in photosynthesis.

Discussion

84.	Mitochondrial DNA is one of the best marker tools for population biologists and evolutionary biologists because _____________(a) Absence of genetic recombination in mt-DNA(b) Mitochondrial genes are specific to mt-DNA(c) It can be easily isolated(d) It undergoes spontaneous mutationThe question was asked in an interview for job.The above asked question is from Mitochondrial Genes: Their Origin and the Effects of Mutations in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct ANSWER is (a) Absence of genetic recombination in mt-DNA Explanation: MITOCHONDRIAL DNA is one of the BEST marker tools for population biologists and evolutionary biologists because of the absence of genetic recombination in mt-DNA.

Discussion

85.	What is the size of human mitochondrial DNA?(a) 16kb(b) 200kb(c) 2500kb(d) 100kbI have been asked this question in a national level competition.My doubt stems from Mitochondrial Genes: Their Origin and the Effects of Mutations in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» RIGHT choice is (a) 16KB Explanation: The size of human mitochondrial DNA is 16kb.

Discussion

86.	Photosynthesis can be described as ____________(a) Reductive, anabolic, endergonic process(b) Reductive, anabolic, exergonic process(c) Oxidative, anabolic, endergonic process(d) Oxidative, catabolic, exergonic processThis question was addressed to me in exam.I need to ask this question from General Features of Photophosphorylation in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct answer is (a) Reductive, anabolic, endergonic process To EXPLAIN: Photosynthesis INVOLVES GAINING of electrons; producing complex substances from simpler ones and REQUIRES energy.

Discussion

87.	NADP is a cofactor used in ____________(a) Catabolic reactions(b) Anabolic reactions(c) Elimination reaction(d) Redox reactionsI have been asked this question by my college director while I was bunking the class.I want to ask this question from Regulation of Oxidative Phosphorylation topic in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right option is (B) ANABOLIC REACTIONS Explanation: NADP is a cofactor used in anabolic reactions.

Discussion

88.	Long-chain fatty acids are oxidized step-wise in one carbon unit starting from ____________(a) Carboxyl end(b) Aliphatic end(c) Carboxyl and Aliphatic end(d) None of the mentionedThe question was asked in an internship interview.Origin of the question is ATP Synthesis topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» RIGHT answer is (a) Carboxyl END The explanation: Long-chain fatty ACIDS are OXIDIZED step-wise in ONE carbon unit starting from carboxyl end.

Discussion

89.	The measure of potential energy stored as a combination of proton and voltage gradients across membrane is termed as ____________(a) Proton motive force(b) Electron motive force(c) Molecule motive force(d) Ion motive forceI have been asked this question during a job interview.My doubt is from ATP Synthesis in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct answer is (a) Proton MOTIVE force Explanation: The measure of potential ENERGY stored as a combination of proton and VOLTAGE gradients across membrane is termed as proton motive force.

Discussion

90.	Which of the following is the prosthetic group of NADH dehydrogenase?(a) NADH(b) FAD(c) NADPH(d) FMNThe question was posed to me in examination.My question is taken from ATP Synthesis-1 topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct answer is (d) FMN Explanation: NADH initially BINDS to complex I and TRANSFERS two ELECTRONS to the flavin mononucleotide (FMN) PROSTHETIC group of the enzyme creating FMNH2.

Discussion

Explore topic-wise InterviewSolutions in .

What is the proportion of ATP produced by oxidative phosphorylation?(a) 60%(b) 70%(c) 80%(d) 90%This question was posed to me in examination.This interesting question is from Regulation of Oxidative Phosphorylation in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry

What is the effect of the excessive rate of apoptosis?(a) Atrophy(b) Sneezing(c) Fever(d) AIDSI have been asked this question in examination.My question is from The Role of Mitochondria in Apoptosis and Oxidative Stress in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry

Which of the following accepts only one electron?(a) Cytochrome b(b) Coenzyme Q(c) FMN(d) FADThe question was posed to me in quiz.Asked question is from ATP Synthesis-1 topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry

Which of the following is the prosthetic group of NADH dehydrogenase?(a) NADH(b) FAD(c) NADPH(d) FMNThe question was posed to me in examination.My question is taken from ATP Synthesis-1 topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry