90 + Interview Questions in Oxidative Phosphorylation and Photophosphorylation in Biochemistry Page 1 InterviewSolution

1.	The earliest photo synthesizers used which of the following as the source of hydrogen?(a) CO2(b) C6H12O6(c) H2O(d) H2SI had been asked this question in exam.I want to ask this question from ATP Synthesis by Photophosphorylation in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct ANSWER is (d) H2S To EXPLAIN I would say: The EARLIEST photo synthesizers USED H2S as the source of HYDROGEN.

Discussion

2.	Why light is required for light dependent reactions?(a) It splits ATP molecules which generates the energy necessary to power the light independent reactions(b) It is the source for electrons(c) It splits the water molecules(d) It energizes electrons in the reaction centerThis question was posed to me in an interview.I'd like to ask this question from ATP Synthesis by Photophosphorylation topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT choice is (d) It energizes electrons in the reaction CENTER To explain I would say: Light energizes electrons in the reaction center, so it is REQUIRED for light dependent reactions.

Discussion

3.	Photosystem II is a ____________(a) Pheophytin-quinone type(b) Ferredoxin type(c) Plastocyanin type(d) Plastocyanin-ferredoxin typeThis question was posed to me during an online interview.I'd like to ask this question from The Central Photochemical Event : Light-Driven Electron Flow in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT CHOICE is (a) Pheophytin-quinone type Easiest explanation: Photosystem II is a pheophytin-quinone type of SYSTEM.

Discussion

4.	Which of the following about Calvin cycle is correct?(a) It is a metabolic pathway by which plants convert CO2 into pentose sugars as the main product(b) With decrease in light intensity, the enzymes are more reactive(c) Rubisco adds CO2 to 3-phosphoglycerate(d) It is a metabolic pathway by which plants convert CO2 and water into carbohydratesI have been asked this question in an internship interview.This interesting question is from General Features of Photophosphorylation topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right OPTION is (d) It is a METABOLIC pathway by which plants CONVERT CO2 and water into carbohydrates The explanation: CO2 combines with ribulose 1, 5-bisphosphate. The enzymes are more reactive if there is an increase in light INTENSITY.

Discussion

5.	The light reaction of photosynthesis takes place in ____________(a) Inner membrane of chloroplast(b) Outer membrane of chloroplast(c) Stroma(d) MatrixThe question was asked in an interview for job.The origin of the question is The Role of Mitochondria in Apoptosis and Oxidative Stress in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right answer is (a) Inner MEMBRANE of chloroplast Explanation: Inner membrane of chloroplast is the area where the LIGHT REACTION of PHOTOSYNTHESIS takes place.

Discussion

6.	Complex 1 is also called _________(a) NADH dehydrogenase(b) Succinate dehydrogenase(c) Cytochrome bc1 complex(d) Cytochrome oxidaseThe question was asked during an interview for a job.I'd like to ask this question from Electron-Transfer reactions in Mitochondria topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct choice is (a) NADH dehydrogenase Best explanation: Complex 2 is called SUCCINATE dehydrogenase. Complex 3 is called the CYTOCHROME bc1 complex. Complex 4 is called cytochrome oxidase.

Discussion

7.	Complex 3 is also called _________(a) NADH dehydrogenase(b) Succinate dehydrogenase(c) Cytochrome bc1 complex(d) Cytochrome oxidaseThe question was asked by my college professor while I was bunking the class.The question is from Electron-Transfer reactions in Mitochondria in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT option is (c) Cytochrome bc1 complex Easiest explanation: Complex 1 is called NADH dehydrogenase. Complex 4 is called cytochrome oxidase. Complex 2 is called SUCCINATE dehydrogenase.

Discussion

8.	Which one of the following is true about C3 plants?(a) First stable product is phosphoglyceric acid(b) Photosynthetically more efficient(c) More efficient in CO2 fixation than C4 plants(d) None of the mentionedThis question was addressed to me by my school principal while I was bunking the class.I would like to ask this question from The Role of Mitochondria in Apoptosis and Oxidative Stress topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct ANSWER is (a) First STABLE product is phosphoglyceric ACID To EXPLAIN I would SAY: The first stable product from C3 plants is phosphoglyceric acid.

Discussion

9.	Which one of the following is the source of electrons in photosynthesis?(a) Carbohydrates(b) CO2(c) Water(d) NADHI had been asked this question in exam.This interesting question is from General Features of Photophosphorylation in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct choice is (c) Water Easy EXPLANATION: Water is the SOURCE of electrons in photosynthesis. These electrons are required to reduce OXIDIZED CHLOROPHYLL a MOLECULES.

Discussion

10.	More than what proportion of mitochondrial proteins are coded by nuclear DNA?(a) 95%(b) 50%(c) 10%(d) 40%This question was addressed to me in an online interview.My query is from Mitochondrial Genes: Their Origin and the Effects of Mutations in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT answer is (a) 95% For EXPLANATION: More than 95% of MITOCHONDRIAL PROTEINS are coded by nuclear DNA.

Discussion

11.	Where does oxidative phosphorylation take place?(a) Ribosomes(b) Nucleus(c) Mitochondria(d) Cell membraneThis question was posed to me in an internship interview.My question is based upon Regulation of Oxidative Phosphorylation topic in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right answer is (C) Mitochondria Easiest explanation: Oxidative PHOSPHORYLATION TAKES place in mitochondria.

Discussion

12.	What is the size of plant mitochondrial DNA?(a) 16kb(b) 200-2500kb(c) 100- 2550kb(d) 100-2500kbThe question was asked during a job interview.Enquiry is from Mitochondrial Genes: Their Origin and the Effects of Mutations in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right choice is (b) 200-2500kb To ELABORATE: The size of plant mitochondrial DNA is in the RANGE of 200-2500kb.

Discussion

13.	The proposal of the chemiosmotic hypothesis was by ____________(a) Peter D. Mitchell(b) Charles Darwin(c) Mendele(d) Alfred RussellThe question was asked in an interview for job.Query is from ATP Synthesis topic in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct ANSWER is (a) Peter D. Mitchell Easy EXPLANATION: Peter D. Mitchell was the ONE to PROPOSE a chemiosmotic hypothesis.

Discussion

14.	If rotenone is added to the mitochondrial electron transport chain then ____________(a) Succinate oxidation remains normal(b) P: O ratio of NADH is reduced from 3:1 to 2:1(c) Oxidative phosphorylation is uncoupled at site I(d) Rate of NADH oxidation is diminished to two-thirds of its initial valueI got this question in quiz.My question is based upon ATP Synthesis-1 topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT choice is (a) Succinate oxidation remains normal To EXPLAIN I would say: If ROTENONE is added to the mitochondrial electron transport chain succinate oxidation remains normal.

Discussion

15.	The only membrane bound enzyme in the citric acid cycle is _________(a) Succinate dehydrogenase(b) NADH dehydrogenase(c) ATP synthase(d) Acyl co-A dehydrogenaseThis question was posed to me in an internship interview.I want to ask this question from Electron-Transfer reactions in Mitochondria topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct choice is (a) Succinate dehydrogenase For explanation: The only MEMBRANE bound enzyme in the CITRIC ACID cycle is succinate dehydrogenase.

Discussion

16.	Photosystem I used which of the following in its photo-center?(a) P700(b) P800(c) P900(d) P600This question was posed to me in exam.The query is from ATP Synthesis by Photophosphorylation in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» RIGHT answer is (a) P700 Easiest explanation: PHOTOSYSTEM I used P700 in its photo-center.

Discussion

17.	Chemiosmotic hypothesis does not involve ____________(a) Only proton transport is strictly regulated, other positively charged ions can diffuse freely across the mitochondrial membrane(b) ATPase activity is reversible(c) Proton flow into the mitochondria depends on the presence of ADP and Pi(d) Electron transport by the respiratory chain pumps protons out of the mitochondriaI have been asked this question in a national level competition.My question is based upon ATP Synthesis-1 topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct CHOICE is (a) Only proton transport is strictly regulated, other positively CHARGED IONS can diffuse FREELY across the mitochondrial membrane Best explanation: Not only proton transport but there is ELECTRON transport also.

Discussion

18.	Which is the first stable product of the dark reaction in C4 plants?(a) Phosphoglyceric acid(b) Oxaloacetic acid(c) Glycolic acid(d) Malic acidThis question was posed to me in homework.The above asked question is from The Role of Mitochondria in Apoptosis and Oxidative Stress in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT choice is (a) Phosphoglyceric acid To explain I would SAY: The FIRST STABLE product of the DARK reaction in C4 plants is phosphoglyceric acid.

Discussion

19.	Effect of valinomycin on oxidative phosphorylation does not involve _____________(a) pH gradient across the inner mitochondrial membrane decreases(b) Rate of flow of electrons increases(c) Rate of oxygen consumption increases(d) Net yield of ATP decreasesI got this question by my college professor while I was bunking the class.My question is taken from ATP Synthesis-1 topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT option is (a) pH gradient ACROSS the INNER mitochondrial membrane decreases For explanation I WOULD SAY: pH gradient does not decrease.

Discussion

20.	Which pigment is used in human vision?(a) Retinal(b) Vitamin A(c) Ferredoxin(d) Beta-caroteneI had been asked this question in class test.The question is from ATP Synthesis by Photophosphorylation topic in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct answer is (a) RETINAL For EXPLANATION I WOULD say: Retinal is USED in human vision.

Discussion

21.	Which of the following statements about thylakoids is false?(a) They contain chlorophyll pigments(b) They contain the photosystems(c) They contain Calvin cycle enzymes(d) They contain the electron transport machineryThe question was asked during an interview.Asked question is from General Features of Photophosphorylation topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct option is (C) They contain Calvin CYCLE enzymes The EXPLANATION: CHLOROPLAST stroma contains Calvin cycle enzymes and intermediates.

Discussion

22.	NADP^+ in its reduced form is ____________(a) NAD(b) NADH(c) NADPH(d) DPHThe question was asked in an interview for internship.This key question is from Regulation of Oxidative Phosphorylation topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right option is (c) NADPH Explanation: NADPH is the reduced form of NADP^+.

Discussion

23.	ATP synthesis by chemiosmosis is by ____________(a) ATP dehydrogenase(b) Gyrase(c) ATP synthase(d) DehydrogenaseThis question was posed to me during an interview.My question comes from ATP Synthesis topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right choice is (C) ATP synthase The BEST I can EXPLAIN: ATP synthase synthesizes ATP by CHEMIOSMOSIS.

Discussion

24.	A lipid-soluble benzoquinone with a long isoprenoid side chain is?(a) Ubiquinone(b) Cytochrome b(c) Cytochrome c(d) Cytochrome aThe question was posed to me in an interview.The origin of the question is Electron-Transfer reactions in Mitochondria topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct choice is (a) UBIQUINONE Best explanation: Ubiquinone also KNOWN as COENZYME Q is a lipid-soluble benzoquinone with a LONG isoprenoid side chain.

Discussion

25.	Protein that contains a nucleic acid derivative of riboflavin is called _________(a) Nucleic acid(b) Amino acid(c) Flavoprotein(d) NoneThis question was posed to me during an interview.This intriguing question comes from Electron-Transfer reactions in Mitochondria in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT choice is (c) Flavoprotein The EXPLANATION is: Flavoproteins CONTAIN a very tightly, sometimes covalently, bound flavin nucleotide, either FMN or FAD.

Discussion

26.	Which of the following describes the complete route by which electrons flow H2O to NADP^+?(a) Z scheme(b) A scheme(c) B scheme(d) X schemeI got this question in final exam.My enquiry is from The Central Photochemical Event : Light-Driven Electron Flow topic in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right answer is (a) Z scheme The best EXPLANATION: Z scheme DESCRIBES the complete route by which ELECTRONS flow H2O to NADP^+.

Discussion

27.	Who is the first person to study the influence of light during photosynthesis?(a) Blackmann(b) Van Niel(c) J. Ingenhouz(d) WarburgThe question was posed to me in class test.This question is from General Features of Photophosphorylation topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct answer is (c) J. Ingenhouz For explanation I WOULD say: Jan Ingenhouz was the BEST known to show that light is essential for PHOTOSYNTHESIS.

Discussion

28.	Which effects the increased levels of hydrogen ions in the inter-membrane space of the mitochondria?(a) Increase ATP production(b) Decreased levels of oxidative phosphorylation(c) Increased levels of water in inter-membrane space(d) Decreased levels of chemiosmosisI had been asked this question in an interview for job.This key question is from Regulation of Oxidative Phosphorylation topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct option is (a) INCREASE ATP production To EXPLAIN: There is an increased ATP production if the LEVELS of HYDROGEN ions increase in the inter-membrane SPACE of the mitochondria.

Discussion

29.	If mitochondria were blocked at the site of NADH oxidation and were treated with succinate as substrate, what would the P : O ratio is?(a) Same as that normally produced by succinate(b) One more than normally produced by succinate(c) One less than normally produced by succinate(d) ZeroThe question was posed to me at a job interview.The above asked question is from ATP Synthesis-1 in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct option is (a) Same as that normally produced by succinate The BEST I can explain: If mitochondria were BLOCKED at the site of NADH OXIDATION and were treated with succinate as SUBSTRATE, the P : O ratio is the same as that normally produced by succinate.

Discussion

30.	What is the rate of electron transfer when proton motive force is high?(a) Faster(b) Slower(c) Moderate(d) NoneThis question was posed to me in unit test.This is a very interesting question from Regulation of Oxidative Phosphorylation topic in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right CHOICE is (B) Slower For EXPLANATION I would say: When proton motive force is HIGH, rate of electron TRANSFER is slower.

Discussion

31.	The first step in the β oxidation of fatty acyl co-A is catalyzed by _________(a) Succinate dehydrogenase(b) NADH dehydrogenase(c) ATP synthase(d) Acyl co-A dehydrogenaseThe question was posed to me in quiz.Origin of the question is Electron-Transfer reactions in Mitochondria in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right ANSWER is (d) Acyl co-A dehydrogenase Explanation: It involves the TRANSFER of ELECTRONS from the substrate to the FAD of the dehydrogenase, then to ETF.

Discussion

32.	Programmed cell death can be termed as ____________(a) Oxidative stress(b) Apoptosis(c) Cell division(d) Cell cycleThe question was posed to me in a national level competition.Enquiry is from The Role of Mitochondria in Apoptosis and Oxidative Stress topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct answer is (b) APOPTOSIS To explain: PROGRAMMED CELL death can be TERMED as apoptosis.

Discussion

33.	What are the favorable conditions for cyclic photophosphorylation?(a) Aerobic and optimum light(b) Aerobic condition only(c) Aerobic and low light intensity(d) Anaerobic and low light intensityThe question was asked in homework.My question comes from General Features of Photophosphorylation in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT choice is (a) Aerobic and optimum light The explanation is: FAVORABLE conditions for CYCLIC PHOTOPHOSPHORYLATION are aerobic and optimum light.

Discussion

34.	The regulation of oxidative phosphorylation depends on ____________(a) Magnitude of ion motive force(b) Magnitude of electron motive force(c) Magnitude of proton motive force(d) None of the mentionedI got this question in class test.My query is from Regulation of Oxidative Phosphorylation in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct CHOICE is (C) MAGNITUDE of proton MOTIVE force For explanation: The regulation of OXIDATIVE phosphorylation depends on the magnitude of proton motive force.

Discussion

35.	Membrane potential and the proton gradient ____________(a) Cancel one another when uncouplers are present(b) Reinforce one another when respiratory inhibitors are present(c) Are sufficient, separately to make ATP from ADP + Pi(d) Are required to make ATPI got this question in semester exam.The question is from ATP Synthesis in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct choice is (d) Are required to MAKE ATP To ELABORATE: MEMBRANE potential and proton GRADIENT are both required to make ATP.

Discussion

36.	The acyl co-A formed in the cytosol is transported to ____________(a) Mitochondrial matrix(b) Microsomes(c) ER(d) Remains in cytosolI got this question in quiz.Question is taken from ATP Synthesis in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Right answer is (a) MITOCHONDRIAL MATRIX Easy explanation: The ACYL co-A FORMED in the cytosol is TRANSPORTED to mitochondrial matrix.

Discussion

37.	Three identical β subunits of the F1 complex during ATP synthesis have ____________(a) Different affinities for ATP and ADP(b) Similar affinities for ADP and ATP(c) Different affinities for ADP but not ATP(d) Different affinities for ATP but not ADPThe question was asked in examination.I'd like to ask this question from ATP Synthesis in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct option is (a) Different affinities for ATP and ADP To EXPLAIN I would say: The CONFORMATIONAL differences among β subunits extend to differences in their ATP/ADP-binding sites.

Discussion

38.	Which one of the following is the one having highest redox potential?(a) Ubiquinone(b) O2(c) FMN(d) NADI had been asked this question in a job interview.This question is from ATP Synthesis-1 topic in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» CORRECT OPTION is (b) O2 Explanation: O2 has the highest REDOX POTENTIAL.

Discussion

39.	A water-soluble protein that carries one electron present in mitochondria is ____________(a) PQB(b) Q(c) Cytochrome c(d) PlastocyaninThis question was posed to me by my college professor while I was bunking the class.My question is taken from The Central Photochemical Event : Light-Driven Electron Flow topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct choice is (C) CYTOCHROME c Explanation: PQB and Q are lipid-soluble PROTEIN; plastocyanin is present in chloroplast.

Discussion

40.	Maximum energy per gram on oxidation is yielded from ____________(a) Starch(b) Fat(c) Glycogen(d) ProteinThe question was posed to me by my school teacher while I was bunking the class.I need to ask this question from ATP Synthesis topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct OPTION is (b) FAT Easy explanation: Fat YIELDS maximum energy per gram on oxidation.

Discussion

41.	In metabolism, NAD is involved in ____________(a) Spontaneous reaction(b) Elimination reaction(c) Redox reactions(d) None of the mentionedThe question was posed to me in class test.This interesting question is from Regulation of Oxidative Phosphorylation topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct ANSWER is (c) REDOX reactions The explanation is: NAD is INVOLVED in redox reactions.

Discussion

42.	NADP-linked dehydrogenase catalyzes _________(a) Glucose 6-phosphate+NADP^+ ↔ 6-phosphogluconate + NADPH + H^+(b) Lactate + NAD^+ ↔ pyruvate + NADH + H^+(c) Pyruvate + CoA + NAD^+ ↔ acetyl-CoA + CO2 + NADH + H^+(d) L-Malate + NAD^+ ↔ oxaloacetate + NADH + H^+I have been asked this question in an online interview.The query is from Electron-Transfer reactions in Mitochondria topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct CHOICE is (a) Glucose 6-phosphate+NADP^+ ↔ 6-phosphogluconate + NADPH + H^+ The BEST EXPLANATION: NADP-linked DEHYDROGENASE catalyzes Glucose 6-phosphate+NADP^+ ↔ 6-phosphogluconate + NADPH + H^+.

Discussion

43.	The carbon-assimilation reactions require ATP and NADPH in the ratio ___________(a) 3:2(b) 2:3(c) 3:4(d) 4:3The question was asked by my school principal while I was bunking the class.Question is from ATP Synthesis by Photophosphorylation topic in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT answer is (a) 3:2 To explain I would say: The carbon-assimilation reactions REQUIRE ATP and NADPH in the RATIO 3:2.

Discussion

44.	The mechanism of action of cyanide, a mitochondrial toxin, is by inhibiting ____________(a) ATP synthase(b) Succinate dehydrogenase(c) Cytochrome c oxidase(d) NADH dehydrogenaseI got this question at a job interview.Question is taken from Mitochondrial Genes: Their Origin and the Effects of Mutations in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct OPTION is (C) CYTOCHROME c oxidase Explanation: Cyanide inhibits cytochrome c oxidase.

Discussion

45.	What is Mitochondrial DNA?(a) Simple, single stranded linear DNA molecule(b) Simple, single stranded circular DNA molecule(c) Simple, double stranded linear DNA molecule(d) Simple, double stranded circular DNA moleculeI got this question in examination.My doubt stems from Mitochondrial Genes: Their Origin and the Effects of Mutations topic in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct option is (d) SIMPLE, DOUBLE stranded CIRCULAR DNA molecule To elaborate: Mitochondrial DNA (mt DNA) is asimple, double stranded circular DNA molecule.

Discussion

46.	How many mitochondrial proteins are encoded in nuclear genes and imported into mitochondria after their synthesis?(a) 600(b) 700(c) 800(d) 900This question was posed to me at a job interview.This question is from Mitochondrial Genes: Their Origin and the Effects of Mutations topic in chapter Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» Correct option is (d) 900 The EXPLANATION is: About 900 different MITOCHONDRIAL proteins are ENCODED in nuclear GENES and imported into mitochondria after their SYNTHESIS.

Discussion

47.	The transport of acyl co-A for oxidation using a shuttle involves the formation of the intermediate ____________(a) Acyl coenzyme A(b) 3 acetyl co-A(c) Acyl cartinine(d) NoneI have been asked this question in an online quiz.This question is from ATP Synthesis in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT option is (C) Acyl cartinine The BEST I can explain: The intermediate acyl cartinine is FORMED in the TRANSPORT of acyl co-A for oxidation using a shuttle.

Discussion

48.	If 2, 4-dinitrophenol is added to tightly coupled mitochondria that are actively oxidizing succinate ____________(a) Electron flow will continue but ATP synthesis will not occur(b) Electron flow will continue but ATP synthesis will be increased(c) Electron flow will cease but ATP synthesis will continue(d) Both electron flow and ATP synthesis will be ceasedThe question was asked in my homework.I want to ask this question from ATP Synthesis-1 in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The CORRECT option is (a) Electron flow will CONTINUE but ATP SYNTHESIS will not occur To explain: Electron TRANSFER is catalyzed from succinate or NADH to O2 but no ATP synthesis is coupled to this RESPIRATION.

Discussion

49.	Which of the following is the correct sequence for the movement of electrons during the light-dependent reactions of plants?(a) P700, P680, NADP^+, water(b) P680, water, P700, NADP^+(c) Water, P700, NADP^+, P680(d) Water, P680, P700, NADP^+The question was asked during an interview.My question is taken from ATP Synthesis by Photophosphorylation in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct ANSWER is (d) Water, P680, P700, NADP^+ Explanation: The sequence for the movement of electrons firstly includes water, SECONDLY P680 then P700 and finally NADP^+.

Discussion

50.	If 8 photons are required to produce one molecule of O2, how many photons are required to produce one molecule of glucose?(a) 6(b) 8(c) 48(d) 12This question was addressed to me during an interview.This intriguing question comes from ATP Synthesis by Photophosphorylation topic in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry
Answer» The correct choice is (c) 48 To explain I would SAY: 6 MOLECULES of O2 MUST be produced during the production of glucose, so 6×8=48 photons are required for producing one molecule of glucose.

Discussion

Explore topic-wise InterviewSolutions in .

What is the size of plant mitochondrial DNA?(a) 16kb(b) 200-2500kb(c) 100- 2550kb(d) 100-2500kbThe question was asked during a job interview.Enquiry is from Mitochondrial Genes: Their Origin and the Effects of Mutations in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry

The proposal of the chemiosmotic hypothesis was by ____________(a) Peter D. Mitchell(b) Charles Darwin(c) Mendele(d) Alfred RussellThe question was asked in an interview for job.Query is from ATP Synthesis topic in division Oxidative Phosphorylation and Photophosphorylation of Biochemistry

Photosystem I used which of the following in its photo-center?(a) P700(b) P800(c) P900(d) P600This question was posed to me in exam.The query is from ATP Synthesis by Photophosphorylation in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry

Which pigment is used in human vision?(a) Retinal(b) Vitamin A(c) Ferredoxin(d) Beta-caroteneI had been asked this question in class test.The question is from ATP Synthesis by Photophosphorylation topic in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry

NADP^+ in its reduced form is ____________(a) NAD(b) NADH(c) NADPH(d) DPHThe question was asked in an interview for internship.This key question is from Regulation of Oxidative Phosphorylation topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry

ATP synthesis by chemiosmosis is by ____________(a) ATP dehydrogenase(b) Gyrase(c) ATP synthase(d) DehydrogenaseThis question was posed to me during an interview.My question comes from ATP Synthesis topic in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry

The acyl co-A formed in the cytosol is transported to ____________(a) Mitochondrial matrix(b) Microsomes(c) ER(d) Remains in cytosolI got this question in quiz.Question is taken from ATP Synthesis in section Oxidative Phosphorylation and Photophosphorylation of Biochemistry

Which one of the following is the one having highest redox potential?(a) Ubiquinone(b) O2(c) FMN(d) NADI had been asked this question in a job interview.This question is from ATP Synthesis-1 topic in portion Oxidative Phosphorylation and Photophosphorylation of Biochemistry