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Q. No.The reaction 2 in the given figure is catalysed by the enzyme:
1. Pyruvate decarboxylase
2. Pyruvate kinase
3. Pyruvate dehydrogenase
4. Pyruvate synthetase
Subtopic: Fermentation |
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Pyruvate, which is formed by the glycolytic catabolism of carbohydrates in the cytosol:
| 1. | undergoes oxidative decarboxylation in cytosol itself by a complex set of reactions catalysed by pyruvic kinase. |
| 2. | undergoes reduction in cytosol itself by a complex set of reactions catalysed by pyruvic dehydrogenase. |
| 3. | undergoes oxidative decarboxylation in mitochondrial matrix by a complex set of reactions catalysed by pyruvic dehydrogenase. |
| 4. | undergoes oxidative phosphorylation in mitochondrial matrix by a complex set of reactions catalysed by pyruvic decarboxylase. |
Subtopic: Aerobic Respiration |
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Which of the following is the complex III of the mitochondrial ETS?
1. NADH dehydrogenase
2. Succinic dehydrogenase
3. Cytochrome bc1 complex
4. Cytochrome c oxidase
1. NADH dehydrogenase
2. Succinic dehydrogenase
3. Cytochrome bc1 complex
4. Cytochrome c oxidase
Subtopic: ETS |
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The reduced ubiquinone (ubiquinol) in the mitochondrial ETS is oxidised with the transfer of electrons to:
1. cytochrome c via succinic dehydrogenase
2. cytochrome c via cytochrome bc1 complex
3. cytochrome bc1 via cytochrome aa3
4. cytochrome bc1 via cytochrome b6f
1. cytochrome c via succinic dehydrogenase
2. cytochrome c via cytochrome bc1 complex
3. cytochrome bc1 via cytochrome aa3
4. cytochrome bc1 via cytochrome b6f
Subtopic: ETS |
77%
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Regarding ATP synthase (complex V):
1. I and II are correct
2. III and IV are correct
3. I and III are correct
4. II and IV are correct
| I: | The F1 headpiece is a peripheral membrane protein complex and contains the site for synthesis of ATP from ADP and inorganic phosphate. |
| II: | F0 is an integral membrane protein complex that forms the channel through which protons cross the inner membrane. |
| III: | The F0 headpiece is a peripheral membrane protein complex and contains the site for synthesis of ATP from ADP and inorganic phosphate. |
| IV: | F1 is an integral membrane protein complex that forms the channel through which protons cross the inner membrane. |
2. III and IV are correct
3. I and III are correct
4. II and IV are correct
Subtopic: ETS |
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Correct comparisons between fermentation and aerobic respiration will include:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| I: | Fermentation accounts for only a partial breakdown of glucose, whereas in aerobic respiration, it is completely degraded to CO2 and H2O. |
| II: | In fermentation, there is a net gain of only two molecules of ATP for each molecule of glucose degraded to pyruvic acid, whereas many more molecules of ATP are generated under aerobic conditions. |
| III: | NADH is oxidised to NAD+ rather slowly in fermentation, however, the reaction is very vigorous in case of aerobic respiration. |
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: THE RESPIRATORY BALANCE SHEET |
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Consider the given two statements:
| Assertion (A): | When carbohydrates are used as respiratory substrate and are completely oxidised, the RQ will be 1. |
| Reason (R): | Equal amounts of CO2 and O2 are evolved and consumed, when carbohydrates are used as respiratory substrate and are completely oxidised. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Respiratory Quotient |
95%
From NCERT
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The number of points in the TCA cycle where FAD+ is reduced to FADH2 is/are:
1. 1
2. 2
3. 3
4. 4
1. 1
2. 2
3. 3
4. 4
Subtopic: Kreb's Cycle |
88%
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Consider the given two statements:
| Assertion (A): | During oxidation within a cell, all the energy contained in respiratory substrates is released free into the cell, in a single step. |
| Reason (R): | The energy released by oxidation in respiration is not (or rather cannot be) used directly but is used to synthesise ATP. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Respiratory Quotient | THE RESPIRATORY BALANCE SHEET |
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Plants can get along without respiratory organs. The reasons for this will include all the following except:
| 1. | Each plant part takes care of its own gas-exchange needs. |
| 2. | Plants present great demands for gas exchange. |
| 3. | The distance that gases must diffuse even in large, bulky plants is not great. |
| 4. | Each living cell in a plant is located quite close to the surface of the plant. |
Subtopic: Introduction |
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