Practice Test


1) While a muscle is in the process of reducing an oxygen debt:


2) NAD functions in cell respiration as a (an):


3) Which of the following statements about oxidative phosphyorylation is not true?


4) Transfer of energy in animal cell is in the form of:


5) The end products of Kerb's cycle are:


6) Acetyl Co-A combines with which of the following compounds to form citric acid:


7) Oxidative phosphorylation is formation of:


8) In the process of respiration the potential energy stored in organic compounds is released in the form of:


9) Glycolysis operates in:


10) Respiratory Quotient (R.Q.) is ratio of:


11) In anaerobic respiration the end product is:


12) Energy rich compound produced in respiration is:


13) Which mineral acts as an activator in isocitric acid dehydrogenase enzyme in Kerb's cycle?


14) During complete aerobic respiration how many ATP are gained in prokaryotes?


15) In proteins R.Q. value is:


16) The inner membranes of mitochondria and chloroplasts:


17) R. Q. is found to be always unity in:


18) How many ATP are produced during anaerobic respiration?


19) If naked pea seeds are kept in four respiratory flasks then they would germinate best if flask contains:


20) What is the link in glycolysis and Kerbs' cycle?


21) Name the scientist who found how the energy of glucose was released in aerobic respiration:


22) In glycolysis the net gain is two ATP molecules and two molecules of are released:


23) The series of reactions in TCA cycle takes place in:


24) In the Krebs' cycle, citric acid is activated by:


25) In the TCA cycle the acid to react with acetyl coenzyme A is:


26) Oxidative phosphorylation is the synthesis of:


27) Glucose is converted into pyruvic acid through a series of reactions with a net gain of:


28) The maximum rate of respiration in many plants of the tropics can be observed in the range of:


29) In woody stems respiration takes place through:


30) During ATP synthesis electrons pass through:


31) The substrate for photorespiration is:


32) Where does ATP synthesis occur?


33) The function of cellular respiration is to:


34) It is not advisable to sleep under trees at night because:


35) The function of mitochondrial cristae is to:


36) The number of molecules of pyruvic acid formed from one moleculs of glucose at the end of glycolysis is:


37) Oxidative phosphorylation takes place on:


38) Which among the following is the most appropriate reason for storing green coloured apples at low temperature?


39) The other name of Glycolysis is:


40) When a cell absorbs energy from the environment, the reaction can be:


41) Importance of Krebs' cycle is:


42) ATP is:


43) Which of the following is not true of glycolysis?


44) When a yeast is producing wine, which of the following is not produced?


45) In the conversion of pyruvic acid to acetyl CoA, pyruvic acid is:


46) Function of coenzyme A is to:


47) Largest amount of phosphate bond energy is produced in the process of respiration during:


48) The process of respiration which result in the formation of pyruvic acid is:


49) In the process of respiration in plants, 180 gms of sugar plus 192 gms of oxygen produce:


50) Pyruvic acid is formed during:


51) Which of the following processes make direct use of oxygen?


52) How many carbon atoms are in an oxaloacetic acid molecule, which joins with an acetyl group during step I of Kerbs' citric acid cycle?


53) At the end of the Kerbs' citric acid cycle, most of the energy removed from glucose molecule has been transferred to:


54) In ETS, the final acceptor of protons is:


55) The atom within each cytochrome molecule that actually accepts and release electrons is:


56) Oxygen which forms part of the ETS, enters the mitochondrion as atom in:


57) Fatty acids enter cellular respiration as:


58) Within the mitochondrion, the proton gradient develops across the:


59) Which is true for glycolysis under aerobic condition?


60) Which is not true for TCA cycle when one acetyl group is oxidized?


61) An organism which does not produce water as waste of respitratory process is likely to be:


62) A high concentration of oxygen above 25%:


63) Lipman system is:


64) It is not advisable to sleep under the trees at night because:


65) Only ATP releasing step in Kerbs' cycle is:


66) Which of these is not true for fermentation?


67) Protein rich pulses have R.Q. equal to:


68) Mineral activator needed for the enzyme carboxylase of TCA cycle is:


69) A huge amount of starch is stored in potatoes, which are underground. This is made possibly by:


70) Which of the following leaves will show maximum rate of respiration?


71) Respiration in methane forming bacteria and de-nitrifying bacteria is:


72) Which of the following respires anaerobically?


73) A molecule of ATP is formed when electron passes from:


74) Most of energy is supplied by mitochondria through:


75) End product of glycolysis is:


76) Which is the link between glycolysis and Kerbs' cycle:


77) The end products of fermentation are:


78) In eukaryotes net gain of ATP in complete oxidation of one molecule of glucose is:


79) In ETS, which is the cytochrome that reacts with oxygen?


80) Instantaneous source of energy is:


81) Anaerobic respiration was reported for the first time by:


82) Oxidative phosphorylation is formation of:


83) Which of the following observations most strongly support the view that mitochondria contain electron-transfer enzymes aggregated into compact associations?


84) Maximum energy becomes available per mole of gulcose when it is metabolised through:


85) Anaerobic respiration is also called:


86) Anaerobic respiration of yeast produces:


87) Metabolism of one palmitic acid yields ATP:


88) Alcoholic fermentation is carried out by:


89) Cytochrome is:


90) In case of Kerbs cycle, the pyruvic acid before combining with oxaloacetic acid is converted to:


91) Which of the following receives electrons at the end of ETC?


92) What is the total production of ATP at the end of complete breakdown of one molecule of glucose during aerobic respiration?


93) Respiration in germinating seeds is usually high but with decline in water and maturation the rate of respiration:


94) PPP shunt is more advantageous than Krebs cycle as:


95) Mechanism of aerobic respiration was discovered by:


96) Dough kept overnight in warm place becomes soft and spongy due to:


97) In glycolysis, electrons are removed by:


98) During which stage in the complete oxidation of glucose are the greatest number of ATP moleculs formed from ADP?


99) Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on:


100) All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is:


101) The overall goal of glycolysis, Kerbs cycle and the electron transport system is the formation of:


102) Which one of the following mammalian cells is not capable of metabolising glucose to carbon-dioxide aerobically?


103) One molecule of glucose on complete oxidation releases how much energy?


104) When two molecules of Tripalmitin are used as a respiratory substrate the RQ is:


105) R.Q. for oxalic acid is"


106) In plants glucose used as a repiratory substrate is derived from:


107) During glycolysis, fructose 1,6 biphosphate is produced by the action of which enzyme?


108) One molecule of ATP yield how much energy?


109) How many molecules of ATP are produced directly from one molecule of glucose during glycolysis:


110) In ETS, complex IV refers to:


111) Sir Hans Adolf Krebs (1900-1987) shared Nobel Prize for physiology and medicine (1953) along with:


112) The end product of fermentation of sugars by Psuedomonas bacteria is:


113) Dming respiration there is:


114) R.Q. is less than one in succulent plants because of:


115) Blood glucose level is not dependent upon muscle glycogen because of absence of:


116) The importance of Krebs cycle is:


117) Kreb's cycle start with the formation of a six carbon compound by the reaction between:


118) Under glycolysis the pyruvic acid is reduced to lactic acid anaerobically in:


119) Which of the following is iron porphyrin coenzyme or cofactor?


120) Which of the following occurs only under aerobic conditions?


121) We get major supply of energy from glucose in:


122) In animal cells, first phase in breakdown of glucose is:


123) Which of the following statements is/are not true?
(a) one ATP molecule yields 32 kJ energy
(b) pentose phosphate pathway was discovered by Dickens
(c) when tripalmitin is used as a substrate, the R.Q. is 0.7
(d) energy relased by one molecule of glucose on complete oxidation corresponds to 1292 kJ.


124) In the electron transport system present in the inner mitochondrial membrane, complexes I and IV are respectively


125) In respiration incomplete oxidation of glucose is done under


126) The cellular respiration first takes place in the


127) Which of the following scientist has given the scheme of glycolysis?


128) Which metabolic pathway is a common pathway to both anaerobic and aerobic metabolism?


129) TCA cycle enzymes are present in


130) Among the following, identify the substrate required for the only oxidative reaction that occurs in the process of glycolysis.


131) Aerobic respiration is


132) What will happen, when glucose is administered orally?


133) How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to carbon dioxide and water yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal?


134) Plants does not need specialised respiratory organ because


135) In which part of mitochondria does ATP synthesis occur?


136) In oxidative decarboxylation, enzyme used to


137) Select the wrong statement.


138) Enzymes found attached to inner membrane of mitochondria instead of matrix is/are


139) Four respiratory enzymes are given below. Arrange them in increasing order of the carbon number of the substrates on which they act.
I. Enolase
II. Aconitase
III. Fumarase
IV. Alcohol Dehydrogenase


140) Link enzyme in cellular respiration is


141) Beer and butter milk are products of fermentation by


142) Apparatus to measure rate of respiration and respiratory quotient is


143) Acetyl Co-A binds to oxaloacetic acid to form


144) Last electron acceptor in respiration is


145) Glucose break down takes place ….. in fermentation


146) Plants need one of the following for ATP formation


147) Fate of pyruvic acid during aerobic respiration is


148) In respiration, respiratory substances can be used


149) In oxidative decarboxylation, only a carbon molecule of pyruvic acid is get oxidised, other two carbon molecule goes to form


150) Fungi are dependent on dead and decaying matter for feeding, it is called


151) Which of the following reaction does not take place in the cell organelle, that is referred to as ‘Power house of the cell’?


152) All enzymes of TCA cycle are located in the mitochondrial matrix except one, which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is


153) The enzymes for TCA cycle are present in


154) In electron transport system, which of the following acts as a final hydrogen acceptor


155) If a starving plant is provided with glucose, the rate of respiration would


156) Which one is product of aerobic respiration?


157) Decline in the activity of the enzyme Hexokinase by glucose-6-phosphate is caused by


158) In which of the following reactions of glycolysis, oxidation takes place?


159) During conversion of pyruvic acid into acetyl Co-A, pyruvic acid is


160) Most of the biological energy is supplied by mitochondria through


161) Chemiosmotic mechanism of ATP production in aerobic respiration was given by


162) In succulent plants like Opuntia, the RQ value will be


163) Respiratory enzymes are present in the following organelle


164) An ATP molecule is structurally most similar to a molecule of


165) Read the following and choose the option containing correct pair
I. DCMU Herbicide Inhibitor of non-cyclic electron transport
II. PMA Fungicide Reduce transpiration
III. Colchicine Alkaloid Causes male sterility
IV. Soilrite Sodium alginate Encapsulation of somatic embryos


166) Oxidation of one molecule of NADH gives rise to


167) In alcohol fermentation,


168) In respiration breaking down of glucose with oxygen is known as


169) Net gain of ATP molecules per hexose during aerobic respiration is


170) Which of these are respiratory poisons or inhibitors of electron transport chain?


171) Kreb’s cycle is completed with the formation of


172) Where is ATP synthesised in glycolysis?


173) Glycolysis takes place in


174) Krebs’ cycle begins with the reaction


175) Co-Factor required for formation of acetyl Co-A is


176) In anaerobic respiration in plants


177) The respiratory quotient (RQ) of some of the compounds are 4,1 and 0.7. These compounds are identified respectively as


178) The enzyme ….. is used to catalysed when condensation of acetyl group with oxaloacetic acid and to yield citric acid


179) The respiratory quotient (RQ) of a germinating castor seed is


180) Glycolysis
I.causes partial oxidation of glucose (one molecule) to form 2-molecules of pyruvic acid and 2 ATP as net gain
II.takes place in all living cells
III.uses 2 ATP at two steps
IV.scheme was given by Gustav Embden, Otto Mayerhof and J Parnas
Choose the correct option containing appropriate statements from the above


181) During oxidative phosphorylation, the net gain of ATP is


182) Decarboxylation is involved in


183) Alternate name of TCA cycle is


184) A businessman of 80 kg weight requires 4800 kcal energy daily. How many ATP molecules and glucose molecules does he require to produce this much energy?


185) Which one of the following pairs is wrongly matched?


186) In hurdle race, which of the following is accumulated in the leg muscle?


187) During the exercise, pyruvic acid is reduced to


188) The compounds which are oxidised during respiration are known as


189) Energy required for life processes is obtained by


190) Choose the correct statement for the given options


191) The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because


192) The process by which there is inhibition of aerobic respiration by atmospheric oxygen is


193) More carbon dioxide is evolved than the volume of oxygen consumed when the respiratory substrate is


194) The main purpose of cellular respiration is to


195) Which of the following substances yield less than 4 kcal/mol when its phosphate bond is hydrolysed?


196) Five gram mole of glucose on complete oxidation releases


197) NADP, NAD and FAD are acceptors of


198) Which of following is connecting link between glycolysis and Krebs’ cycle?


199) Which one of the following reactions is an example of oxidative Decarboxylation?


200) Release of energy by breaking down of C-C bond of various organic molecules by oxidation process for cellular use is known as


201) Krebs’ cycle was discovered by Krebs in pigeon muscles in 1940. Which step is called gateway step/link reaction/transition reaction in respiration?


202) Correct sequence of electron acceptor of ATP synthesis is


203) The number of ATP produced when a molecule of glucose undergoes fermentation


204) Oxidative decarboxylation is


205) Fermentation is


206) Citric acid cycle is the alternate name of which of the following?


207) When one molecule of glucose is completely oxidized during aerobic respiration, how many molecules of carbon dioxide are released due to Tricarboxylic acid cycle?


208) The RQ value of oxalic acid is


209) Energy currency of cell is


210) Break down process is also called


211) The energy-releasing metabolic process in which substrate is oxidized without an external electron acceptor, is called


212) How many times ATP is utilised in glycolysis?


213) Aerobic respiration takes place in


214) Which of the following is a 4-carbon compound?


215) An example of non-competitive inhibition is


216) What is the net ATP molecules gain, when 4 molecules of glucose undergo anaerobic respiration in plant?


217) Chemiosmosis hypothesis given by Peter Mitchell proposes the mechanism of


218) Glycolysis


219) Citric acid cycle is also known as


220) Instantaneous source of energy is


221) Before entering into the respiratory pathway fats breakdown into


222) In which of the following reactions of glycolysis, a molecule of water is removed from the substrate?


223) The reactions of Pentose Phosphate Pathway (PPP) take place in


224) In citric acid cycle first step is


225) Which of the following substrate can enter into the respiration?


226) RQ value of 4 may be expected for the complete oxidation of which one of the following?


227) When act as a respiratory substrate, which of the following would be broken down to acetyl Co-A?


228) Anaerobic respiration generally occurs in


229) Cell respiration is carried out by


230) The released energy obtained by oxidation is stored as


231) Respiratory Quotient (RQ) is one in case of


232) Which of the following substrates is used in the formation of alcohol?


233) Which one is correct sequence in glycolysis?


234) Cyanide resistant pathway is


235) Common enzyme in glycolysis and pentose phosphate pathway is


236) Phase common in aerobic and anaerobic respiration is


237) In the production of ethanol, pyruvic acid is first converted to acetaldehyde by the enzyme.


238) The activity of succinate Dehydrogenase is inhibited by


239) Citric acid is industrially best produced by


240) Respiratory substrate are the organic substance which are ….. during respiration to liberate energy


241) Preparatory phase before fermentation is


242) For retting of jute the fermenting microbe used is


243) The respiratory quotient during cellular respiration would depend on the


244) Protein directly cannot be used as a respiratory substrate, it breaks down into


245) Ethyl alcohol is commercially manufactured from


246) Biological oxidation in Krebs’ cycle involves


247) Last electron acceptor during ETS is


248) Which enzyme converts glucose into alcohol?


249) Glycolysis is a part of


250) When tripalmitin is used as a substrate in respiration, the RQ is


251) Read the following table and choose the correct pair.
V. DCMU Herbicide Inhibitor of non-cyclic electron transport
VI. PMA Fungicide Reduce transpiration
VII. Colchicine Alkaloid Causes male sterility
VIII. Soilrite Sodium alginate Encapsulation of somatic embryos


252) In anaerobic respiration bacteria produce


253) During its formation, bread becomes porous due to release of Carbon dioxide by the action of


254) Before entering respiratory pathway amino acids are


255) The intermediate compound common for aerobic and anaerobic respiration is


256) How many ATP molecules are obtained from fermentation of 1 molecule of glucose?


257) During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?


258) In plants the cells in the interior parts are


259) Ultimate source of energy in biosphere, is


260) Dough kept overnight in warm weather becomes soft and spongy because of


261) The respiratory quotient (RQ) or respiratory ratio is


262) Maximum amount of energy/ATP is liberated on oxidation of


263) Net yield of ATP molecules in aerobic respiration during Krebs’ cycle per glucose molecule is


264) Respiratory quotient can very due to


265) In anaerobic respiration the correct sequence of catabolism of glucose is


266) In eukaryotes, photosynthesis occurs in


267) In yeast during anaerobic respiration, how many glucose molecules are required for production of 38 ATP molecules?


268) Which of the following is involved in the catalysis of link reaction during aerobic respiration?


269) Choose the correct combination of A and B in accordance with the NCERT text book.The NADH synthesised in …A… is transferred into the mitochondria and undergoes oxidative …B…


270) Total gain of ATP molecules during aerobic respiration of one molecule of glucose


271) Which of the following enzyme is responsible for formation of glucose from glucose-6-phosphate?


272) Alcoholic fermentation takes place in the presence of


273) Which of these steps in Krebs’ cycle indicates substrate level phosphorylation?


274) The main purpose of electron transport chain is to


275) How many ATP are formed during the citric acid cycle?


276) RQ is always less than one in


277) In glycolysis from glucose to pyruvic acid involves more than seven reaction. Each individual reaction needs


278) Which one is true for ATP?


279) Oxidative phosphorylation refers to


280) Which one is not correct about Krebs’ cycle?


281) Which specialised cell provides interconnectivity for air spaces?


282) Steps of respiration are controlled by


283) The process by which ATP is produced in the inner membrane of a mitochondrion, the electron transport system transfers protons from the inner compartment to the outer, as the protons flow back to the inner compartment, the energy of their movement is used to add phosphate to ADP, forming ATP is


284) The haem protein complexes, which act as oxidizing agents are known as


285) If RQ is 0.6 in a respiratory metabolism, it would mean that


286) A scientist added a chemical (cyanide) to an animal cell to stop aerobic respiration. Which of the following is most likely to have been affected by this treatment?


287) Wine and beer are produced directly by fermentation. Brandy and whisky require both fermentation and distillation because


288) For gaseous exchange plants have


289) Citric acid cycle was discovered by


290) Vitamin-C was the first vitamin to be produced by a fermentation process using


291) Net gain of ATP from one molecule of glucose in glycolysis, is


292) In Krebs’ cycle, GTP is formed in


293) The net gain of ATP from complete oxidation of one molecule of glucose in eukaryote is


294) Animals are


295) During Kreb’s cycle of …A… NADH, …B… ATP is produced through ETS in mitochondria. Choose, the correct pair from the option given below


296) Product of glycolysis is


297) Electron Transport System (ETS) occurs in


298) In aerobic respiration, citric acid cycle takes place in


299) If RQ is less than 1.0 in a respiratory metabolism, it would mean that


300) Calorie is the unit of


301) Which of the following organism is useful in the preparation of Roquefort cheese?


302) What is the correct order of the stages of cellular respiration?


303) The term glycolysis has originated from the Greek word ….. and ….


304) The organelle associated with aerobic respiration is


305) Incomplete breakdown of sugar in anaerobic respiration forms


306) The total energy trapped per gm mole of glucose is 1292 kJ with on efficiency of


307) Phase common in aerobic and anaerobic respiration is


308) Synthesis process in organism is also called


309) Which of the following process takes place in mitochondria?


310) How much percentage of energy is released during lactic acid and alcoholic of fermentation?


311) Calculation of ATP gain for every glucose is made on certain assumptions. Choose the correct option in accordance with the statement given above


312) Sucrose is converted into


313) Which of the following respiratory substrates requires the highest number of oxygen molecules for its complete oxidation?


314) The metabolic pathway through which the electron passes from one carrier to another is called


315) In which one of the following options, the two names refer to one and the same thing?


316) The complete combustion of glucose in respiration is represented by


317) The overall goal of glycolysis, Krebs’ cycle and the electron transport system is the formation of