NEET UG Biology Respiration MCQs

IMPORTANT POINTS

• Important of Respiration in living organisms. The breakdown of C-C bonds of complex compounds through oxidation with in cell releasing considerable amount of energy is called respiration.

• Glycolysis : The breakdown of glucose to pyruyic acid is called glycolysis. This process occurs in the cytoplasm of cells.

• There are three major ways in which different cell handle pyruyic acid these are lactic acid fermentation, alcoholic fermentation and aerobic respiration.

• Aerobic respiration includes krebs cycle and oxidative phosphorylation in addition to glycolysis.

• All reaction of krebs cycle are carried out in the matrix of mitochondria and ETS (oxidative phosphorylation) carried out on inner membrance of mitochondria.

• Respiratory pathway is involved in both anabolic and catabolic processes and hence it is also known as an amphibolic pathway rather then as a catabolic one.

• During aerobic respiration O₂ is consumed and CO₂ is released. The ratio of CO₂ to the O₂ consumed during respiration is called Respiratory Quotient (RQ)

For the given options select the correct options (a, b, c, d) each carries one mark.

1. Respiration is 

(a) Anabolic process   (b) Catabolic process

(c) Both a and b   (d) Endothermic process.

2. Metabolism involves

(a) Anabolic process   (b) Catabolic process

(c) Both a and b   (d) Only redox process

3. Organisms obtain energy through

(a) Reproduction   (b) Excretion

(c) Respiration   (d) Digestion

4. Respirations is a

(a) Endepgonic process   (b) Exergonic process

(c) Both A and B   (d) Neutralisation reaction

5. During respiration the food is

(a) Oxidised   (b) Reduced

(c) Both oxidised and reduced   (d) Neither oxidised nor reduced

6. Which of the following is a main respiratory substrate in animals

(a) Fructose   (b) Starch   (c) Glucose   (d) Proteins  

7. During the formation of ATP from ADP, which is released

(a) Water (b) Oxygen (c) Both A and B (d) Energy

8. Respiration is found in

(a) Bacteria (b) Prokaryotes (c) Only animals (d) All these

9. Respiratory substrate is completely oxidised in

(a) Aerobic respiration (b) Anaerobic’ respiration.

(c) Both A and B (d) Fermentation

10. In which of the following types of respiration, the amount of energy released is comparatively more

(a) Aerobic respiration (b) Anaerobic respiration

(c) Equal energy is released in both A and B (d) None of these in correct

11. Fermentation occurs in the

(a) Presence of oxygen (b) Presence of water

(c) Absence of oxygen (d) Mitochondria

12. First stage in respiration is

(a) Glycolysis (b) Krebs cycle (c) ETS (d) Glycogenesis

13. Glucose is converted to pyruvic acid in

(a) Krebs cycle (b) C₄ cycle (c) C₃ cycle (d) Glycolysis.

14. Number of pyruvic acid molecules formed in glycolysis is 

(a) l (b) 2 (c) 3 (d) 6

15. Number of carbons present in a pyruvic acid t molecule is

(a) 2 (b) 3 (c) 4 (d) 6

16. Glycolysis occurs in 

(a) Cytoplasm (b) Mitochondria (c) Chloroplast (d) Golgi complex

17. Number of oxygen molecules used in glycolysis

(a) 12 (b) 4 (c) 6 (d) 0

18. Number of CO2 molecules produced in glycolysis is

(a) 2 (b) 3 (c) 4 (d) 0

19. In respiration, final acceptor of protons is :

(a) Oxygen (b) NAD⁺ (c) FAD (d) UQ

20. Which is not formed during anaerobic respiration ?

(a) Pyruvate (b) Ethyl alcohol (c) Acetyl CoA (d) CO₂

21. ADP combines with inorganic phosphate (Pi) to give

(a) ATP (b) AMK (c) GDP (d) GTP

22. Dihydroxy acetone phosphate is a

(a) 2 C compound (b) 3 C compound (c) 4 C compound (d) 6 C compound

23. Number of ATPs consumed in glycolysis are

(a) 2 (b) 4 (c) 6 (d) 8 

24. Substrate in glycolysis is normally

(a) Fructose (b) Glucose

(c) Pyruvic acid (d) Phosphoglyceric acid

25. Decarboxylation of pyruvic acid results in the formation of

(a) Water (b) Acetyl CoA (c) Glucose (d) PGA.

26. Number of direct ATPs produced in glycolysis is 

(a) 2 (b) 4 (c) 6 (d) 1

27. Number of reduced coenzymes NADH produced during glycolysis are

(a) 1 (b) 2 (c) 4 (d) 6

28. Net gain of glycolysis is

(a) 3 ATP and 1 NADH + H ⁺ (b) 2 ATP and 2 NADH + H ⁺

(c) 6 ATP and 4 NADH + H ⁺(d) 10 ATP and 6 NADH + H ⁺

29. In respiration, the oxygen is used in

(a) Glycolysis (b) Krebs cycle (c) ETS (d) Fermentation

30. One molecules of NADH⁺ H ⁺ gives how many ATPs in ETS

(a) 2 ATP (b) 3 ATP (c) 4 ATP (d) 6 ATP

31. Conversion of pyruvic acid to acetyl Co A is called

(a) Glycolysis (b) Fermentation

(c) ETS (d) Oxidative decarboxylation

32. Reduction of acetaldehyde gives

(a) Methyl alcohol (b) Ethyl alcohol (c) Glycerol (d) All these

33. Lactic acid is formed due to the reduction of 

(a) Pyruvic acid (b) Acetaldehyde (c) Malic acid (d) Acetyl CoA

34. Fermentation is the primary mode of energy production in

(a) Higher plants (b) Animals (c) Yeast (d) Algae.

35. Krebs cycle occurs in 

(a) Cytoplasmic matrix (b) Mitochondrial matrix

(c) F1 particles (d) All these

36. Krebs cycle is also known as

(a) Citric acid cycle (b) TCA cycle (c) Both a and b (d) Calvin cycle

37. The location of ETS is ;

(a) Mitochondria! matrix (b) Cytoplasm

(c) Outer mitochondrial membranes (d) Inner mitochondrial membrane

38. Krebs cycle starts with the condensation of acetyl CoA with

(a) Pyruvic aicd (b) Oxalo-acetic acid (c) Malic acid (d) Citric acid

39. α - keto glutaric acid consists of

(a) 3 carbons (b) 4 carbons (c) 5 carbons (d) 6 carbons

40. Citric acid cycle was proposed by

(a) Krebs (b) Calvin (c) Mendel (d) Lavosier

41. Direct synthesis of ATPs in one turn of Krebs cycle is

(a) l (b) 2 (c) 3 (d) 4

42. Number of NADH + H⁺, formed in one turn of Krebs cycle is

(a) 2 (b) 4 (c) 6 (d) 5

43. Number of FADH₂ formed in one turn of Krebs cycle is

(a) l (b) 2 (c) 3 (d) 4

44. Number of ATPs which can be generated by one FADH₂ in ETS are 

(a) l (b) 2 (c) 3 (d) 4

45. Formation of ATPs in mitochondria is known as

(a) Oxidative phosphorylation (b) Cyclic photophosphorylation

(c) Noncyclic photophosphorylatian (d) Fermentation

46. Formation of ATP occurs

(a) In outer mitochondrial membrane (b) On F1 particles

(c) Mitochondrial matrix (d) In mitochondrial DNA

47. Phosphorylation means

(a) Formation of reduced coenzymes (b) Formation of PGA

(c) Formation of ATP (d) Breakdown of ATP

48. Oxidative phosphorylation occurs in

(a) Mitochondria (b) Chloroplast (c) Cytoplasm (d) Golgi bodies

49. The metal ion present in cytochromes is

(a) Copper (b) Iron (c) Magnesium (d) Zinc

50. CO₂ release occurs in

(a) Photosynthesis (b) Respiration (c) Transpiration (d) Guttation

51. R.Q. stands for

(a) Reduction quotient (b) Respiratory quotient (c) Reverse quotient (d) None of these

52. R.Q. of carbohydrates is

(a) l (b) 2 (c) 3 (d) 4

53. R.Q. of anaerobic respiration is

(a) Zero (b) Infinity (c) Less than one (d) More than one

54. When amount of CO₂ taken from atmosphere (in photosynthesis) becomes equal to the amount of CO₂ released in atmosphere (in respiration), this is called

(a) Final point (b) Compensation point

(c) Balance point (d) Equal distribution

55. Alternative pathway for respiration is

(a) Photorespiration (b) Pentose phosphate pathway

(c) C₃ cycle (d) C₄ cycle

56. Which of the following processes is common for aerobic and anaerobic respiration

(a) Glycolysis (b) Krebs cycle (c) ETS (d) None of these

57. Anaerobic respiration is also called

(a) Fermentation (b) PPP pathway (c) Glycolysis (d) Krebs cycle

58. How many ATP are formed during dephosphorylation in glycolysis ?

(a) 2ATP (b) 4ATP (c) 3 ATP (d) 6ATP

59. R.Q. of oxalic acid is

(a) Infinity (b) 4 (c) 0.7 (d) 1

60. Which process occurs in cytosol ?

(a) Photosynthesis (b) Krebs cycle

(c) Glycolysis (d) Oxidative phosphorylation

61. Synthetic processes of a cell comes under

(a) Anabolism (b) Metabolism (c) Catabolism (d) Growth 

62. Degradation processes of a cell are referred under

(a) Anabolism (b) Catabolism (c) Metabolism (d) Growth 

63. Pyruvic acid is

(a) CH₃COCOOH (b) CH₃CHO (c) CH₃CHOH COOH (d) CH₃CH₂OH 

64. CH₃CHO is

(a) Acetaldehyde (b) Pyruvic acid (c) Ethanol (d) Lactic acid 

65.  CH₃CH₂OH represents

(a) Lactic acid (b) Acetic acid (c) Ethanol (d) Pyruvic add 

66. Respiratory substances are

(a) Substances available from air (b) Nutritive substances present in food

(c) Mineral elements (d) Excretory substances 

67. For aerobic respiration, it is essential

(a) O₂ (b) CO₂ (c) CO (d) H₂S 

68. Acetaldehyde is formed from pyruvic acid, if it is removed

(a) H₂ (b) CHO (c) 2 OH (d) CO₂ 

69. Respiration type occurring in human red blood corpuscles is

(a) Anaerobic (b) Aerobic (c) Both A and B (d) Fermentation 

70. Yeast

(a) Respires an aerobically, due to lack of mitochondria

(b) Respires aerobically, if it gets O₂, otherwise perform alcoholic fermentation

(c) Respires aerobically

(d) Can perform alcoholic fermentation 

71. The end product of glycolysis of a glucose molecule is

(a) Pyruvic acid, NADH₂ and ADP (b) Pyruvic acid, 2H⁺, 2e and 4 ATP

(c) 2 Pyruvic acid, 2NADH₂ and ATP (d) 2 Pyruvic acid, NADH₂ and 2 ATP 

72. The enzyme required to form acetaldehyde from pyruvic acid is

(a) Hexokinase (b) Oxidase

(c) Pyruvic acid decarboxylase (d) Alcohol dehydrogenase 

73. Phosphorylation in general is ________

(a) Combination of phosphoric acid with a chemical

(b) Formation of PGA by adding P to glycerate

(c) Addition of ATP to glucose

(d) Synthesis ATP from ADP and P 

74. Fructose 1,6 biphosphate splits into

(a) PGAL and DHAP (b) PGAL and PGA (c) PGAL and BPGA (d) PGA and BPGA. 

75. Oxidative phosphorylation occurs in

(a) Cytosol (b) Cristae

(c) Mitochondrial matrix (d) Endoplasmic reticulum, 

76. Malic acid is formed from fumaric acid

(a) By addition of  CO₂ (b) By addition of H₂O (c) By removal of H₂O (d) By removal of  CO₂ 

77. If CO₂ and 2H are removed from pyruvic acid, it is formed

(a) Acetyl co-enzyme A (b) Citric acid (c) Acetate (d) Co-A 

78. It is by-product of Kreb’s cycle

(a) Oxaloacetic acid (b) Citric acid (c) Acetyl co-enzyme (d) Acetate. 

79. One ATP is formed when

(a) Succinic acid → Fumaric acid (b) α -ketoglutaric acid → Succinyl CoA

(c) Succinyl CoA →Succinic acid (d) Fumaric acid → Malic acid. 

80. Respiratory quotient and compensation point are

(a) Not related (b) Inverse to each other

(c) Same (d) Applicable to.all organisms. 

81. RQ = l, is

(a) The multiplication O₂ consumedO₂ and released CO₂

(b) The amount of O₂, consumed and CO₂released are the same

(c) One CO₂ molecule more released than O₂ molecule consumed

(d) One O₂molecule more consumed than CO₂ molecules released 

82. If RQ is 0.7, the substance needs

(a) More O₂ for respiration

(b) Less O₂ for respiration

(c) O₂ is not used for its respiration

(d) The substance has more oxygen in its constitution 

83. The site of occurrance of all reactions of PPP is

(a) Cytosol (b) Mitochondrial matrix

(c) Cristae (d) Thylakoid matrix 

84. The process occurring during Kreb’s cycle is

(a) Decarboxylation and dehydrogenation

(b) Decarboxylation, dehydrogenation and phosphorylation

(c) Decarboxylation and phosphorylation

(d) Dehydrogenation and phosphorylation 

85. During glycolysis water is released from

a) 2, Phospoglyceric acid (b) Biphosphoglyceric acid

(c) Phosphoenol pyruvic acid (d) Phosphoglyceraldehyde 

86. When human muscle contracts :

(a) Respiration does not occur

(b) Anaerobic respiration occurs, if supply of oxygen is insufficient

(c) Anaerobic respiration never occurs

(d) Always anaerobic respiration occurs. 

87. The correct sequence of the three processes of aerobic respiration is

(a) Glycolysis, Kreb’s cycle, oxidative phosphorylation.

(b) Glycolysis, oxidative phosphorylation and Kreb’s cycle

(c) Kreb’s cycle, glycolysis and oxidative phosphorylation

(d) oxidative phosphorylation, Kreb’s cycle, glycolysis 

88. During PPP, RuBP is formed in

(a) Mitochondria (b) Cytosol (c) Stroma (d) Chloroplas 

89. The number of ATP molecules formed in oxidative phosphorylation of one glucose molecule

(a) 6 (b) 14 (c) 28 (d) 34 

90. The number of ATP molecules formed in oxidative phosphorylation of 1 pyruvic acid

(a) 6 (b)14 (c) 28 (d) 34 

91. How much energy spent in transport of one pyruvic acid to mitochondrion ?

(a) Energy of 1 ATP (b) No energy (c) Energy of 2 ATP (d) Not certain 

92. In anaerobic respiration in plants 

(a) Oxygen is absorbed (b) Oxygen is released

(c) Carbon dioxide is released (d) Carbon dioxide is absorbed. 

93. Krebs cycle takes place in

(a) Vesicles of E.R (b) Mitochondria (c) Dictyosomes (d) Chloroplasts. 

94. By ETS, ATP-synthesis occurs on the 

(a) Outer membrane of mitochondrion (b) Inner membrane of mitochondrion

(c) Matrix (d) None of the above 

95. Energy currency (reservoir) of the cells is

(a) AMP (b) ATP (c) RNA (d) DNA 

96. Complete oxidation of glucose into pyruvic acid with several intermediate steps is known as

(a) TCA-pathway (b) Glycolysis (c) HMS-pathway (d) Krebs cycle 

97. When a molecule of pyruvic acid is subjected to anaerobic oxidation and forms lactic acid, there is

(a) Loss of 3 ATP molecules (b) Loss of 6 ATP molecules

(c) Gain of 2 ATP molecules (d) Gain of 4 ATP molecules 

98. Conversion of pyruvic acid into ethyl alcohol is facilitated by the enzyme 

(a) Decarboxylase (b) Dehydrogenase

(c) Decarboxylase and dehydrogenase (d) Phosphotase 

99. RQ for fatty substance/fat is 

(a) Infinity (b) Less than one (c) Greater than one (d) Zero 

100. RQ for glucose carbohydrate is

(a) 1 (b) 0.5 (c) 2 (d) 0.05 

101. An indispensable role in energy metabolism is played by 

(a) Sodium (b) Phosphorus (c) Calcium (d) Lithium 

102. Instantaneous source of energy is 

(a) Glucose (b) Fats (c) Proteins (d) Amino acid. 

103. ATP equivalents produced during oxidation of succinate to fumarate for one glucose molecule is/are

(a) l (b) 2 (c) 3 (d) 4 

104. Which of the following process is used in the conversion of pyruvate to acetyl CoA ?

(a) Oxidative decarboxylation (b) Oxidative dehydrogenation

(c) Oxidative dehydration (d) Oxidative phosphorylation 

105. During ATP synthesis electrons pass through 

(a) H₂O (b) Cytochromes (c) CO₂(d) O₂ 

106. Net gain of ATP in glycolysis _______

(a) 6 (b) 2 (c) 4 (d) 8 

107. The universal hydrogen acceptor is ‘ 

(a) NAD (b)ATP (c) CoA (d) FMN 

108. Both respiration and photosynthesis require

(a) Sunlight (b) Chlorophyll (c) Glucose (d) Cytochromes 

109. In an organism utilising carbohydrates as its source of energy anaerobically, the R.Q. is likely

(a) 0.7 (b) 0.9 (c) l.0 (d) Infinity. 

110. In plants energy is produced during the process of 

(a) Photosynthesis (b) Transpiration (c) Respiration (d) Water absorption 

111. In respiration pyruvic acid is 

(a) Formed only when oxygen is available

(b) One of the products of Krebs cycle

(c) Broken down into a two carbon fragment and CO₂

(d) A result of protlipid breakdown. 

112. Maximum number of ATP is synthcsised during oxidation of

(a)β - amino acid (b) Malic acid (c) Palmitic acid (d) Glucose 

113. NADP⁺ is reduced to NADPH in 

(a) HMP (b) Calvin Cycle (c) Glycolysis (d) EMP 

114. Incomplete breakdown of sugars in anaerobic respiration forms

(a) Fructose and water (b) Glucose and CO₂ (c) Alcohol and CO₂ (d) Water and CO₂ 

115. Which of the following is the source of respiration ? 

(a) RNA (b) DNA (c) ATP (d) Stored food

116. Raw material of respiration is

(a) Glucose and fructose (b) Glucose and sucrose

(c) Glucose + O₂ d) Glucose + CO₂ 

117. Respiration is found in 

(a) In all living cells in light (b) All living cells in dark

(c) In all living cells both in light and dark (d) Only in nongreen cells both in light and dark 

118. Anaerobic respiration is 

(a) Extramolecular respiration (b) Molecular respiration

(c) Inter-molecular respiration (d) Intra-molecular respiration.

119. Total gain of energy in anaerobic respiration from one glucose molecule is

(a) Two ATP (b) One ATP (c) Four ATP (d) Three ATP 

120. Final electron acceptor in respiration is

(a) Hydrogen (b) Oxygen (c) Cytochromes (d) Dehydrogenases 

121. Oxidative phosphorylation is found in

(a) Chloroplasts (b) Leucoplasts (c) Peroxisomes (d) Mitochondria 

122. In Opunita and other succulents, night time R.Q. is

(a) One (b) More than one (c) Zero (d) Less than one 

123. RQ of protein rich pulses is ‘

(a) Unity (b) Infinity (c) More than unity (d) Less than one 

124. Oxidation of a molecule of acetyl CoA produces

(a) 12 ATP (b) 15 ATP (c) 6 ATP (d) 19 ATP 

125. Maximum amount of energy/ATP is liberated on oxidation of

(a) Fats (b) Proteins (c) Starch (d) Vitamins 

126. R.Q. is ratio of ;

(a) CO₂ produced to substrate consumed

(b) CO₂ produced to O₂ consumed

(c) Oxygen consumed to water produced

(d) Oxygen consumed to CO₂ produced 

127. Connecting link between glycolysis and Krebs cycle is/before entering Krebs cycle pyruvate is changed to

 (a) Oxaloacetate (b) PEP (c) Pyruvate (d) Acetyl CoA 

128. Apparatus to measure rate of respiration and R.Q. is

(a) Auxanometer (b) Potometer (c) Respirometer (d) Manometer 

129. Terminal cytochrome of respiratory chain which donates electrons to oxygen is

(a) Cyt b (b) Cyt c (c) Cyt a (d) Cyt a₃ 

130. R.Q. is maximum when respiratory substrate is

(a) Glucose (b) Fat (c) Protein (d) Malic acid. 

131. End product of citric add/Krebs cycle is

(a) Citric acid (b) Lactic acid (c) Pyruvic acid (d) CO₂ + H₂O 

132. Krebs cycle is

(a) Oxidation of glucose to alcohol and water

(b) Oxidation of acetyl CoA to carbon dioxide and water involving electron transport

(c) Complete oxidation of acetyl CoA without electron transport

(d) Complete reduction of acetyl CoA to carbon dioxide and water. 

133. Most of the biological energy is supplied by mitochondria through

(a) Breaking of proteins (b) Reduction NADP⁺

(c) Breaking of sugars (d) Oxidising TCA substrates. 

134. Which one is a product of glycolysis, besides 2 ATP ?

(a) FAD (b) NADH (c) NAD (d) NADP 

135. The site of Krebs cycle in bacteria is

(a) Nucleoid (b) Cytoplasm (c) Plasma membrane (d) Ribosomes 

136. Which is the product of aerobic respiration?

(a) Malic acid (b) Ethyl alcohol (c) Lactic acid (d) Pyruvic acid 

137. Which one can respire in the absence of oxygen ?

(a) Seeds (b) Leaves (c) Stem (d) Root 

138. Lactic acid fermentation does not produce

(a) ATP (b) CO₂ and NADH (c) CO₂ (d) NADH 

139. Electron transport system of mitochondria is located in

(a) Outer membrane (b) Inner membrane (c) Inter-cristal space (d) Outer chamber.

140. In bacteria the site for respiration is

(a) Cytoplasm (b) Mesosome (c) Episome (d) Plasmid

141. Which is wrong about cytochrome P-450 ?

(a) Contains iron (b) Is a coloured cell

(c) Is an enzyme (d) Plays an important role in metabolism.

142. Production of alcohol by Yeast fermentation is____ process

(a) Anaerobic (b) Aerobic (c) Light dependent (d) Both A and C.

143. In glycolysis, enzyme enolasc produces

(a) Phosphoglyceric acid (b) Phosphoenol pyruvate

(c) Phosphoglyceraldehyde (d) Pyruvate

144. Oxygen is reduced to water in

(a) Fermentation (b) Calvin cycle

(c) Electron transport (d) Krebs cycle (e) Glycolysis

145. Cytochrome is

(a) Metalloflavoprotein (b) Fe-containing porphyrin pigment

(c) Lipid (d) Glycoprotein

146. Isocitric acid is changed to α -oxalosucinic acid by

(a) Oxidative carboxylation (b) Oxidative decarboxylation

(c) Dehydrogenation (d) Hydrogenation and decarboxylation.

147. In respiration 

(a) 2 PGAL are formed in glycolysis and none in Krebs cycle

(b) 6 PGAL in glycolysis, 3 PGAL in Krebs cycle

(c) 8 PGAL in glycolysis, 3 PGAL in Krebs cycle

(d) PGAL formation does not occur in respiration.

148. Glycolysis takes place in 

a) All cells (b) Only eukaryotic cells

(c) Muscle cells (d) Nerve cells

149. Which is rich in energy 

(a) NAD+ (b) Mitochondria (c) FAD (d) ATP

150. Which one requires oxygen 

(a) Fermentation (b) EMP pathway

(c) Pentose phosphate pathway (d) None of the above

151. Mechanism of aerobic respiration was discovered by

(a) Calvin (b) Krebs (c) Pasteur (d) Hatch and Slack

152. Which of the following is the first step of glycolysis 

(a) Conversion of glucose to fructose (b) Dehydrogenation of glucose

(c) Breakdown of glucose (d) Phosphorylation of glucose

153. How many ATP molecules are released when one molecule of glucose is oxidised in our liver cells

(a) 36 (b) 38 (c) 2 (d) 8

154. RQ of anaerobic respiration is 

(a) < 1 (b) 0 (c) 1 (d) >1

155. Which one is an important intermediate formed in all types of respiration 

(a) Acetyl CoA (b) Oxaloacetate (c) Pyruvic acid (d) Tricarboxylic acid

156. What is RQ of the reaction 2C₅₁H₉₈O₆ + 145O₂ –→ 10₂CO₂ + 98H₂O. 

(a) 0.7 (b) l.0 (c) l.45 (d) l.62

157. Single turn of citric acid cycle yields 

(a) 2 FADH₂, 2 NADH₂, 2 ATP (b) 1 FADH₂, 2 NADH₂, 1 ATP

(c) 1 FADH₂, 4 NADH₂, 1 ATP (d) 1 FADH₂, 1 NADH₂, 1 ATP

(E) 1 FADH₂,1 NADH₂, 2 ATP.

158. RQ is less than one, if the respiratory substrate is 

(a) Organic acids (b) Fats and proteins (c) Sucrose (d) Glucose

159. Enzyme used in conversion of glucose to glucose 6-phosphate is 

(a) Hexokinase (b) Isomerase

(c) Phosphokinase (d) Phosphohexokinase

160. Identify the compound that links glycolysis and Krebs cycle 

(a) Oxaloacctate (b) Pyruvic acid (c) Lactic acid (d) Acetyl CoA

161. F0 base of oxysome is towards : 

(a) Outer chamber (b) Matrix (c) Inner chamber (d) Both B and C

162. Muscle cells starved of oxygen and supplied with pyruvic acid will produce 

(a) Ethanol (b) Lactic acids (c) CO₂ only (d) CO₂ and H₂O

163. Products of anaerobic respiration are 

(a) Water and alcohol (b) Water and oxygen (c) Alcohol and CO₂ (d) CO₂ and water

164. During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP 

(a) Glycolysis (b) Krebs cycle

(c) Conversion of pyruvic acid to acetyl CoA (d) Electron transport chain.

165. How many molecules of NADH₂ are produced when four molecules of phosphogyceraldehyde arc converted into four molecules of pyruvate 

(a) 8 (b) 2 (c) 4 (d) 6

166. The overall goal of glycolysis, Krebs cycle and electron transport system is the formation of

(a) ATP in one large oxidation reaction (b) Sugars

(c) Nucleic acid (d) ATP in small steps