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Q. No.Correct comparisons between fermentation and aerobic respiration will include:
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.
1. Only I and II
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 |
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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 |
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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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How many ATP molecules are directly synthesised in the glycolytic pathway from one glucose molecule?
1. 2
2. 4
3. 10
4. 30
1. 2
2. 4
3. 10
4. 30
Subtopic: Glycolysis Regulation | Respiratory Quotient | THE RESPIRATORY BALANCE SHEET |
64%
From NCERT
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For aerobic respiration to take place within the mitochondria, the final product of glycolysis, pyruvate:
| 1. | is transported from the cytoplasm into the mitochondria. |
| 2. | undergoes oxidative decarboxylation in the cytosol. |
| 3. | is reduced to lactate in liver. |
| 4. | is transported from the cytoplasm first into the Golgi apparatus, where it is packaged and then transported into the mitochondrion. |
Subtopic: Glycolysis | Glycolysis Regulation | Aerobic Respiration |
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The crucial events in aerobic respiration are:
1. Only A is correct
2. Only B is correct
3. Both A and B are correct
4. Both A and B are incorrect
| A: | The partial oxidation of pyruvate by the stepwise removal of all the hydrogen atoms, leaving six molecules of CO2. |
| B: | The passing on of the electrons removed as part of the hydrogen atoms to molecular O2 with simultaneous synthesis of ATP. |
2. Only B is correct
3. Both A and B are correct
4. Both A and B are incorrect
Subtopic: Aerobic Respiration |
63%
From NCERT
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Two successive steps of decarboxylation in the TCA cycle lead to the formation of:
1. α-ketoglutaric acid
2. fumaric acid
3. isocitric acid
4. succinyl-CoA
1. α-ketoglutaric acid
2. fumaric acid
3. isocitric acid
4. succinyl-CoA
Subtopic: Kreb's Cycle |
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It is possible to make calculations of the net gain of ATP for every glucose molecule oxidised; but in reality this can remain only a theoretical exercise. These calculations can be made only on certain assumptions including all the following except:
| 1. | There is a sequential, orderly pathway functioning, with one substrate forming the next and with glycolysis, TCA cycle and ETS pathway following one after another. |
| 2. | The NADH synthesised in glycolysis does not get transferred into the mitochondria and does not undergo oxidative phosphorylation. |
| 3. | None of the intermediates in the pathway are utilised to synthesise any other compound. |
| 4. | Only glucose is being respired – no other alternative substrates are entering in the pathway at any of the intermediary stages. |
Subtopic: Glycolysis | Glycolysis Regulation |
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