Chapter 12 ee Cellular Respiration Questions Based on NCERT Textbook Wp Which of the following statement is correct ? (2) The most common respiratory substrate is protein (b) During oxidation of respiratory substrate within a cell all the energy is released in a single step (©) The energy released by the oxidation of respiratory substrate cannot be used directly so, is used to synthesise ATP which is broked down whenever energy needs to be utilised @ Energy is released by reduction of respiratory substrates 2, Plants : (@) Unlike animals, have no special organs for gaseous exchange (b) Have stomata and lenticels for gaseous exchange (© Lack breathing mechanism (@) More than one option is correct 3. Plants can get along without respiratory organs for following reason(s) : (@) There is little transport of gases from one plant part to another () Roots, stems and leaves respire at rates far lower than the animals do (© Only during photosynthesis, large volume of gases are exchanged (@ Both (a) and (b) 4. Read the following statements : i @ Glycolysis is common both to aerobic and anaerobic respiration (i) The ATP made during glycolysi substrate level phosphorylation Glycolysis involves complete oxidation of glucose In plants, sucrose is converted into glucose and fructose by the enzyme, invertase and these two monosaccharides readily enters glycolysis. (v) ATPis utilised in three different steps of glycolysis Which of the above statements are correct ? @ @, @ and Gv) is generated by Git) (iv) ) (ii), (iv) © Gid, @ (ii), (iv) and (») ‘The ATP formed during glycolysis is formed by : (@) Electron transport chain (b) Chemiosmosis (© Oxidation of NADH+ Ht to NAD* (@) Substrate level phosphorylation Which process in eukaryotic cells will proceed normally whether O, is present or absent ? (@) Electron transport chain (b) Oxidative phosphorylation © Glycolysis @ Chemiosmosis Substrate level phosphorylation accounts for approximately what percentage of the ATP formed by the reactions of glycolysis ? (a) 100% (b) 2% © 10% @) 38%204 | NCERT Botany Booster ej] 8. What are the products of glycolysis ? (a) CO, and H,0 % UO ATP, NaDHL+ HT, pyrwate / 7 () TP, FADH,, pyruvate ‘V @ ATP, NADH +H, 1,0, C0, 9. Starting with one molecule of glucose, the energy containing products of glycolysis are : (a) 2NADH+H’, 2 Pyruvate, 2 ATP (b) 2 FADH,, 2 Pyruvate, 2 ATP ,/ (©) 2NADH+H", 2CO,, 2 ATP (@) 2 Pyruvate, 8 ATP, 2 CO, 10. Why is glycolysis described as having an investment phase and pay-off phase ? (a) It splits molecules as well as assembles molecules () It attaches and detaches phosphate groups (©) Ituses stored ATP and then forms a net increase in ATP (@ It uses glucose and generates pyruvate 411. The transport of pyruvate into mitochondria is a type of: (2) Active transport () Diffusion (© Facilitated diffusion (a) Osmosis 12. Match the column ; , amt ‘ ‘A. Pyruvate 0 B. 3-phosphoglycerate | (ii) C. Dihydroxyacetone | (iii) phosphate D. Glyceraldehyde-3- | civ) phosphate (@) A=(, B=), C= Gi, D= Gi) @) A=), B=@, C= (wv), D= Gi) © Gi), B= (iv), C , D=) @A=(@, B= G@), C= Wy), D= Gi) 13. During cellular respiration, acetyl CoA accumulates in which location ? (a) Cytosol () Mitochondrial matrix (© Outer chamber or intermembrane space of mitochondria (@ Inner membrane of mitochondria 14. Find out the correct statement : (a) There are three major ways in which different cells handle pyruvie acid produced by glycolysis, latie acid fermentation, alcoholic fermentation and aerobic respiration (b) Fermentation cannot be performed by eukaryotes (© For complete oxidation of glucose to CO, and H,0 Krebs’ cycle is required butO, is nota requirement (@) Electron transport chain can occur without the presence of oxygen 15. During aerobic respiration, electrons travel downhill in which sequence ? (a) Glucose ATP — Pyruvate > 0, (b) Food NADH + H* Electron transport chain-> On (© Glucose -+ ATP -> Electron transport chain NADH +H" @) ATP Glucose 0, — Pyruvate 16. Read the following statements : @ The maximum concentration of alcohol in beverages that are naturally fermented is less than 3% Gi) Yeasts poison themselves to death when the concentration of alcohol reaches about 13% Gii)_In both lactic acid and alcoholic fermentation not, much energy is released, less than 7% of the energy in glucose is released and not all of it is trapped as high energy bonds of ATP Gv) The ratio of ATP formed in aerobic and anaerobic respiration is 18 : 1 (¥) During aerobic respiration, complete oxidation of respiratory substrate releases energy, CO, but not water, How many of the above statements are correct ? (a) Five (b) Four (©) Three @ Two 17. Choose the incorrect statement w.r.t. crucial events in aerobic respiration : (@) The passing on of the electrons removed as part of atoms to molecular O, with simultaneous synthesis of ATP occurs(b) The complete oxidation of pyruvate by the stepwise removal of all the H-atoms, leaving three molecules of CO, takes place (©) Krebs’ cycle occurs in mitochondrial matrix and electron transport chain in intermembrane space (@) 02 is important for electron transport chain to be functional 18. Observe the reaction performed by pyruvate dehydrogenase complex : Pyruvie Me ru Acetyl CoA + CO, NAD+ NADH + H+ ‘The two more cofactors required in the above reaction are: (@) Lipoic acid and Thiamine Pyrophosphate (TPP) (©) FAD and lipoic acid (© FAD and TPP @ None of the above 19, What fraction of CO exhaled by animals is generated by the reactions of citric acid cycle, if glucose is the sole source of energy ? @ V2 &) 2/3 © V3 @ V6 20. Identify A, B and C in the major pathways of anaerobic respiration shown below : Glucose Glyceraldehyde ‘3.-Phosphate ke 1,3-bis-phosphoglyceric netic acid acid 4 o ‘3-Phosphoglycerié-acid Pyruvic acid NS ea Ethanol + CO, A B c (a) NAD* NADH+H* NADH +H* () NADH+H? |. NAD* NADH +H" (©) NaDt NAD* NADH + H* @ NADH+H* NADH+H™ NAD* IF* Cellular Respiration [205 21, The TCA cycle starts with the condensation of A with B and C to yield citric acid A B c (a) co, Acetyl CoA OA (b) H,0. OAA Succinate (© OAA Acetyl CoA Fumarate @ Acetyl group OAA HO 22, In cellular respiration, the energy for most ATP synthesis is supplied by = (a) High energy phosphate bonds in organic molecules (b) Converting oxygen to ATP (© A proton gradient across a membrane (@) Generating CO, and oxygen in the electron transport chain 23, ‘The common component of TCA cycle and electron transport chain is (a) Succinate dehydrogenase complex ~ (b) ATP synthase (© Acetyl CoA (@ Suecinyl CoA 24. The total number of substrate level phosphorylation in cellular respiration as a result of complete oxidation of one glucose molecule is @6 ©) 3 os @4 25. A connecting link between TCA cycle and nitrogen metabolism is: (a) Pyruvate (b) orketoglutarate (© Citrate @ OAA 26. Number of reduced coenzymes produced in three turns of Krebs’ cycle is : @2 ) 24 © 12 @1 How many molecules of metabolic water (.e., produced by electron transport system) are produced in glycolysis in the absence of oxygen : (a) Zero (b) 2 oO4 @i 28. Site of TCA cycle in aerobic bacteria is : (2) Cytoplasm (©) Mitochondrial matrix (© Plasma membrane (@) Inner mitochondrial membrane ‘The number of ATP molecules formed per molecule of ‘oxygen used in aerobic respiration is : @6 ws © 16 @4[fs NcERr Botany Booster # I] How many oxygen atoms are required for the complete oxidation of one molecule of pyruvate ? (a) 2 ) 5 4 @3 How many ATP molecules will be produced when one molecule of 3-phosphosphoglyceric acid is completely oxidised : . @ 16 (b) 32 © 64 @ 48 Suppose a total of 38 ATP are formed in aerobic respiration, then the number of ATP formed outside mitochondria will be : @2V 14 © 18 @) 20 33. How many ATP molecules will be produced in a brain cell (neuron) from a glucose molecule involving electron transport chain only ? 31. 32, “@) 32 ) 16 © 38 @) 34 34. How many ATP molecules are produced after complete oxidation of one molecule of _fructose-1, 6-bis-phosphate ? (a) 40 b) 32 © 38 @) 44 35. In TCA cycle, acetyl group of acetyl CoA is oxidised t , (@) 0, (b) co, © Ny @ Allof these ‘How many ATP molecules are formed from one molecule of acetyl GoA in TCA cycle ? ie (@1 (b) 13 © 24 @2 37. Malonic acid is a competitive inhibitor of : (a) Citric acid (b) Succinic acid (© Malic acid @ Oxalosuccinie acid In TCA cycle during conversion of a succinyl CoA into a succinic acid molecule : (a) One molecule of GTP is synthesised (b) Substrate level phosphorylation occurs (©) FADH, is involved (@) More than one option is correct 39. Which of the following is correct w.r.t. Krebs’ cycle ? (a) The primary acceptor of acetyl CoA is OAA (b) CO, is not produced (©) FADH, is oxidised to NAD* \Q @) All of the above & 40. Which of the following is correct for substrate level phosphorylation of TCA cycle ? 38. (@) Itoceurs during the conversion of succinyl CoA into succinic acid (b) GTP formed is converted to GDP with the simultaneous synthesis of ATP from ADP (©) It does not involve electron transport chain of mitochondria (@) Allof the above 41, The continued oxidation of acetyl CoA via TCA cycle requires the continued replenishment of : (a) OAA (b) NAD* © FAD @ Allofthese 42. The primary role of 0, in cellular respiration is to: (@), Actas an acceptor of electrons and protons forming water (b) Combine with carbon forming CO, © Catalyse reactions of glycolysis @ Combine with lactate, forming pyruvate 43. A test tube containing sugar solution and Saccharomyces is kept in a warm area for a night, The gas collected from this mixture : (@) Tums lime water milky (®) Extinguishes the flame (©) Both (a) and (b) (@) Causes explosion when ignited 44, Dough kept overnight in warm weather becomes soft and spongy as a result of : (@) CO, absorption from the surrounding: (b) Fermentation (© Both (a) and (b) . (@) 0, release 45. Ethyl alcohol fermentation can be observed in : (@) Rhizopus (b) Lactobacillus © Cortical cells of plants (@) None of the above 46. Anaerobic respiration occurs in y. (a) Cytoplasm (©) Vacuole © Nucleus (@) Mitochondria 47. Energy released by the electron transport chain is used to pump H" into which location in eukaryotic cells ? @ Cytosol . (b) Mitochondrial intermembrane space (© Mitochondrial matrix (@) Mitochondrial outer membrane 48. When H* are pumped into intermembrane space from mitochondrial matrix, the result is the :(@) Formation of ATP (b) Reduction of NADP* (©) Greation of a proton motive force (@ Lowering of pH in the mitochondrial matrix 49. Which of the following yields the most ATP when slucose is completely oxidised ? (@) Glycolysis () TCA cycle (©) Oxidative phosphorylation (@ Conversion of pyruvate to acetyl CoA 50. It is possible to prepare vesicles from portions of the inner mitochondrial membrane. Which one of the following processes could still be carried on by this isolated inner membrane ? (@) The TCA cycle (b) Oxidative phosphorylation (© Reduction of NAD* (@ Glycolysis and fermentation 51. What is proton motive force mitochondrial respiratory mechanism ? (@) The force exerted on protons by a transmembrane proton concentration gradient (©) The force required to remove an electron from hydrogen (© The force that moves hydrogen into the intermembrane space (@) The force that moves hydrogen to NAD* 52. The ATP made during fermentation is generated by : (@) The electron transport chain () Substrate level phosphorylation (© Chemiosmosis @ Aerobic respiration 53. In alcoholic fermentation, NAD* is regenerated from NADH+H" by: (a) Reduction of acetaldehyde to ethanol (0) Oxidation of pyruvate to acetyl CoA (©) Reduction of ethanol to pyruvate (@) Oxidation of ethanol to acetyl CoA 34, Which of the following steps of glycolysis is associated with the utilisation of ATP? (@) F-1, 6 bis-phosphate -> F-6-phosphate (b) PEP pyruvate (©) Glucose -» Glucose-6-phosphate (@) Both (a) and () 55. The fate of pyruvic acid during aerol (@) Oxidative decarboxylation (©) Oxidative phosphorylation (MF) wart. respiration is : al IE (© Alcoholic fermentation (@) Lactic acid fermentation 56. The respiration in germinating seeds produce energy which can be detected in the form of : (@) Heat evolution _()0, evolution (© CO, evolution _ (4) Water evolution 57. Seeds respire (@) Only aerobically (b) Only anaerobically (© Both aerobically and anaerobically (@) In the presence of CO, 58. Select the isomers : (@) DHAP and PGAL (b) 2-PGA and 3-PGA (© Fructose-6-phosphate and Glucose-6-phsophate (@) All of the above are isomers 59. Choose the substrate level phosphorylation reaction steps : (a) PEP — Pyruvate (b) Succinyl CoA —> Succinate © 1, 3bis-phosphoglycerate— 3-PGA @ Ailof the above 60. The respiratory pathway is : (@) Catabolic only _(b) Anabolic only (© Amphibolic (@) Endothermic 61, Match the column : Cellular Respiration Column-t Column 3 ‘A. Double aminated | @ Glycogen compound, B. Storage form of | (i) Asparagine slucose ©. Fats made of three | (ii) Citric acid fatty acid chain attached to glycerol Tricarboxylic acid__| (iv) _Triglyceride @ A=), B=@,-¢ WA=@, B=G © A= (Gi, B @A=(, B 62. In Krebs's cycle carboxylation and dehydrogenation occurs : @ 2,6 (b) 2,4 © 4,2 @ 6,2 63. Which of the following occurs both in the presence or absence of 0, ? (@) Fermentation © TeAcycle () Glycolysis (@ Chemiosmosis[208° [> NCERT Botany Booster * i 64, Match the column : Column-I Column-II ‘A. Peripheral membrane | (i) Complex-IlL protein of ATP synthase B. Pyruvate dehydrogenase | (i) Fy complex C. . Integral membrane protein | (iii) of ATP synthase D. Cytochrome be, (iv) Mitochondrial a atrix @, C= Gi, D (iv), C = Gi), D (i), C= @, D @A (i), C= Gi), D 65. The net ATP molecules in glycolysis during aerobic respiration is : @8 4 oo @3 66. Terminal electron acceptor during mitochondrial electron transport chain is : @ Cyt ay ©) Cyc © Oz @ co, 67. In electron transport chain, electron moves from carriers that have redox potential to those which have redox potential : @ High, low (®) Low, high (© Zero, ze10 (@) None of these 68. Why is glycolysis considered to be one of the first ‘metabolic pathways to have evolved ? (@ It does not involve organelles or specialised structures and is found in most organisms (b) It produces much less ATP than does oxidative phosphorylation (© Itis found in prokaryotic cells but not in eukaryotic cells (@) Itrelies on chemiosmosis 69. For ATP produced, Ht passes through Fy from the intermembrane space to the matrix down the electrochemical proton gradient : (a) Three, six (b) Each, six © Two, six @ Six, six 70. What is the net gain of ATP molecules during aerobic oxidation of one glucose molecule ? (a) 32 (b) 16 © 36 @ 18 71. Read the following statements : (@ Glycerol enters the glycolytic pathway after being converted into phosphoglyceraldehyde (PGAL) (i) In fermentation, there is a net gain of only two molecules of ATP for each molecule of glucose degraded into pyurvic acid (iii) NADH +H? is oxidised to NAD* rather slowly in fermentation, however the reaction is very vigorous in case of aerobic respiration (iv) If fatty acids are to be respired, they are first degradated into acetyl CoA (v) When skeletal muscle cells undergo anaerobic respiration, they become fatigued and pain ‘occurs due to build up of lactate How many of the above statements are correct ? (@ Two ©) Five (© Four (@) Three 72. How many net ATP molecules will be formed in a plant cell as a result of complete oxidation of one molecule of glucose ? @ 36 (b) 32 © 34 @ 39 73. Match the column : Col 1 Column-I ‘A. Complex-I ‘Cytochrome be, complex B, Complex it © Complexill D._Complexiv ‘Succinate dehydrogenase Cytochrome-c-oxidase NADH-dehydrogenase OA @a 74. Select the wrong match w.r.t. respiratory quotient (RA (a) Proteins = 0.9 (b) Carbohydrate = 1 (© Tripalmitin = 4 (@ Organic acid = >1 75. Which of the following compound will have R.Q. less than unity ? (@) CgyHy,0g (b) CigH3602 (© CyHOs @ More than one option is correct 76. You have a friend who lost 5 kg of fat on a regiment of strict diet and exercise, How did the fat leave his body? (a) It was converted into heat and then released (b) It was released as CO, and H,O(© It was converted into ATP which weighs much less than fat @ It was converted into amino acid and eliminated from the body 77. Phosphofructokinase (PFK) is an allosteric enzyme that catalyses the conversion of Fructose-6-phosphate to Fructose 1, 6-bisphosphate. In the presence of O,, an increase in the amount of ATP in a cell would be expected to : G@) Inhibit the enzyme, thus slow the rate of glycolysis (b) Activate the enzyme, thus slow the rate of slycolysis (© Inhibit the enzyme, thus increase the rate of glycolysis (@ Activate the enzyme, thus increase the rate of slycolysis 78. What is the purpose of beta-oxidation in respiration ? (a) Breakdown of fatty acids (®) Oxidation of pyruvate (© Control of ATP formation (4) Oxidation of glucose 79. If pyruvate oxidation is blocked, what will happen to the levels of oxaloacetic acid (OAA) and citric acid in the TCA-cycle ? (@) ‘There will be no change in the levels of OAA and citric acid (b) OAA will accumulate and citric acid will decrease (© OAAwill decrease and citric acid will increase (@) Both OAA and citric acid will decrease 80. What is the oxidising agent in the following reaction ? Pyruvate + NADH +H* —» Lactate + NAD* (@) NADH +H" (©) Pyruvate (©) Lactate (@ NADY; 81. When electron flow along the electron transport chain of mitochondria, which of the following changes occur? (@) The pH of matrix increases (©) ATP synthase pumps proton by active transport (© NAD? is oxidised (@ The cytochromes phosphorylate ADP to form ATP I al ee 82. Out of five different protein complexes (I, Il, I, 1V and V) present in the inner mitochondrial membrane : (@) 1,11, Il and IV are electron transporters () I, Ml and IV act as proton pumps (© V is not an electron transporter but helps in synthesis of ATP (@ Allare correct 83. In the electron transport chain of mitochondria ubiquinone (CoQ) is a common electron acceptor of : (a) Complexes-I and It (©) Complexes-II and Il (© Complexes-II and IV (@) Complexes-I and IIT ‘84. Read the following statements w.r-t, electron transport chain and oxidative phosphorylation (@ Ubiquinone receives reducing equivalent via FADH, (complex-II) Gi) Cytochrome-c is a small protein attached to the outer surface of the inner mitochondrial membrane (ii) Both CoQ and eytochrome-e are mobile electron carriers in the inner mitochondrial membrane Gv) Coupling reaction is : ATP —> ADP + Pi (W) The presence of 0 is vital as it drives the whole process of removing hydrogen from the system ‘Which of the above statement is/are correct ? @ (, Gd, (ii) and () ©) Gv) only © Gid, 9), @ ©, Gid, Gv) 85. Which of the following is lactic acid ? (@), CHSCH(OH)CO,H (b) CH,COCO,H (© CH,CH(CHs)CO.H (@) CH COOH Cellular Respiration(PRAG] > went Botany Booster «J Answers” LQ o2@ 2M 4@ &@ 60 7@ & O% % @ 1% | 1. @ 1% © 1% OH 1% @ 15.) 16. © 17. © 18. @) 1% ©) 20 21. @ 2 © 23 @ 24 @ 25. 0) 26 © 27 @ 28 G@ 2% @ 30 & 31. (@) 32 @ 33. @ 34 @ 35. @) 36,,@) 37 ) 38 @ 3% @ 40 4. @ 4 @ 48. © 44. @ 45. @ 46. @ 47 © 48 © 4% © 5% w 51. (@) 52 @) 53. @ 54. (SB. (@) 56. (a) 57% 58. A) 59 AD) 60.) 61. (a) 62. (b+) 63. (b) 64 (@) 65. (@) 66. () 67. (bt) 68. (a) 6% (a) 70. 71.) 72 @ 73. © 74% (© 75. @ 76. () 77. @ 78 @ 7% ©) 8% 81L_@ 8% @ 83. @) 84 @ _85._(@)lE* Cellular Respiration al Be Questions from NCERT Exemplar ep 1. The ultimate electron acceptor of respiration in’ an aerobic organism is ; (a) Cytochrome (b) Oxygen (© Hydrogen @) Glucose 2. Phosphorylation of glucose during glycdlysis’ ‘is catalyzed by : (@) Phosphoglucomutase (b) Phosphoglucoisomerase (© Hexokinase (@ Phosphorylase 3. Pyruvic acid, the key product of glycolysis can have many metabolic fates. Under aerobic condition it forms: (@) Lactic acid (b) CO, +H,0 (© Acetyl COA + CO; (4) Ethanol + CO, 4, Hlectron Transport System (ETS) is located in mitochondrial : . (@ Outer membrane (b) Inner membrane space (© Inner membrane (4) Matrix 5. Which of the following exhibits the highest rate of respiration ? (a) Growing shoot apex (b) Germinating seed (©) Root tip @ Leaf bud 6. Mitochondria are called powerhouses of the cell. Which of the following observations support this statement? (a) Mitochondria synthesize ATP (b) Mitochondria have a double membrane (© The enzymes of the Krebs’ cycle and the cytochromes are found in mitochondria (@) Mitochondria are found in almost all plant and animal cells, ‘The end product of oxidative phosphorylation is : (a) NADH (b) Oxygen © ADP (@ ATP + H,0 8. Match the following and choose the correct option from give below Column- ‘A. Molecular oxygen | () B, Electron-acceptor | (ii) ©. Pyruvate wi dehydrogenase Decarboxylation_| (iv) Acetyl CoA @aA Column-It a-Ketoglutaric acid Hydrogen acceptor Cytochrome C © Lo, 2 © 8 O 4 © i , Answers : 6 @ 72 @ 8 @ructions = 1 seth eu es reason are true and the reason is the correct explanation of the assertion then mark (a). 2, Ifboth a reason are true but the reason is not the correct explanation of the assertion, then mark (b). 3 Ifassertion is true but reason is false, then mark (c). 4, [fboth assertion and reason are false statements then mark (d). 1A 2 At 3. A 7A: S.A R 10. a: ‘The aerobic respiration is biocnergetically is more efficient than anaerobic glycolysis, ‘The aerobic respiration occurs in the mitochondria, while glycolysis is purely cytosolic. F, particles are present in the inner mitochondrial membrane. . ‘An electron gradient formed on the inner mitochondrial membrane forms ATP. (AIMs 2008) Glycolysis is the first step of respiration in which, glucose completely breaks into CO, and H,0. In this process, there is net gain of twenty four molecules of ATP. (AIIMs 2009) In Krebs’ cycle, in two turns, 2ATP are formed directly. In Krebs’ cycle, substrate level phosphorylation occurs. Broxidation of fatty acids in eukaryotes mainly occur in the cytoplasm. Cytoplasmic enzymes only perform oxidation. : In cyanide resistant respiration, huge amount of ATPis liberated. ‘The site of cyanide resistant pathway is cytoplasm. 2, 4-dinitrophenol is a type of ‘uncoupler’ in ‘molecular respiration. It does allow coupling reaction (ADP + Pi ATP). : The site of PPP (Pentose Phosphate Pathway) is cytoplasm. The enzymes related to PPP cytoplasm. RQ. of fats is less than unity. ural oxygen So, requires more are found in the Fats are poor in struct oxygen for oxidation. ; ATP formation during respira endergonic process. ATP formation requires energy input: tion is a type of Is 11. A: 17. At 18. Ar 19. At Cellular Respiration oy] 27, ‘The conversion of glyceraldehyde-3-phosphate into 1,3 bis-phosphoglycerate is an oxidation reaction. The above reaction uses NAD*. Fermentation is the incomplete oxidation of glucose into ethyl alcohol or ethanol. Fermentation occur in prokaryotes only. Respiratory pathway is amphibolic pathway. During respiration, there is breakdown of substances as well as synthesis of substances from respiratory intermediates. ‘The first reaction step of TCA cycle is a condensation reaction. CAA unites with acetyl part of acetyl CoA to form citric acid G The R.Q. of protein is slightly greater than one. Protein is the preferred respiratory substrate. During vigorous exercise, anaerobic respiration occurs in muscle cells. Pyruvic acid is reduced to lactic acid in the absence of 0. Electron transport chain involves flow of electrons. Electron transport chain can occur in the absence of Op. During aerobic respiration complete breakdown of one glucose molecule yields six molecules of CO. CO, is evolved during TCA cycle. Unlike photophosphorylation where it is the light energy that is utilised for the production of proton. gradient required for phosphorylation, in respiration, it is the energy of oxidation-reduction utilised for the same process. ATP formation in mitochondria is called oxidative phosphorylation. Complex-II (succinate dehydrogenase) is involved in Krebs' cycle It is a transmembrane protein bound to the inner mitochondrial membrane.£ F2ie] [B+ cert Botany Booster ¢)]] le LO. 20 8 @ 4@ &@ 6&6 WM 7% © 1. @ 12% © 13 @ 14 @ 15. @ 16. @ 17, © 8. 18, @ ) 9. 19. @ ) 10. 20. @ o