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Q. No.The glycolytic pathway has an investment of 2 ATP molecules. At which of the following steps is the debt paid off?
1.
Conversion of Glucose into Glucose-6-phospahte
2.
Conversion of Fructose-6-phosphate into Fructose 1,6-biphospahte
3.
Conversion of 1,3 biphoshoglyceric acid into 3-phosphoglyceric acid
4.
Conversion of Phosphoenol pyruvate into Pyruvic acid
Subtopic: Glycolysis |
58%
From NCERT
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Consider the two given statements:
| Assertion (A): | In aerobic cellular respiration the presence of oxygen is vital. |
| Reason (R): | Oxygen acts as the final hydrogen acceptor. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | (A) is True but (R) is False |
| 3. | (A) is False but (R) is True |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A) |
Subtopic: ETS |
79%
From NCERT
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Conversion of sucrose into glucose and fructose is catalyzed by:
| 1. | Phosphofructokinase | 2. | Aldolase |
| 3. | Hexokinase | 4. | Invertase |
Subtopic: Glycolysis |
84%
From NCERT
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Regeneration of which of the following is an important role of fermentation in cellular respiration:
1. NADH
2. NADP+
3. NAD+
4. NADPH
1. NADH
2. NADP+
3. NAD+
4. NADPH
Subtopic: Fermentation |
74%
From NCERT
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“Plants can get along without respiratory organs”. The valid arguments in favour of the statement will be:
| I: | Each plant part takes care of its own gas-exchange needs. |
| II: | Plants do not present great demands for gas exchange. |
| III: | The distance that gases must diffuse even in large, bulky plants is not great. |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
Subtopic: Introduction |
79%
From NCERT
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Consider the given two statements:
Assertion (A): All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen.
Reason (R) : The first cells on this planet lived in an atmosphere that lacked oxygen.
1. Both (A) and (R) are true but (R) is not the correct explanation of (A).
2. (A) is true but (R) is false.
3. Both (A) and (R) are true and (R) correctly explains (A).
4. (A) is false but (R) is true.
Assertion (A): All living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen.
Reason (R) : The first cells on this planet lived in an atmosphere that lacked oxygen.
1. Both (A) and (R) are true but (R) is not the correct explanation of (A).
2. (A) is true but (R) is false.
3. Both (A) and (R) are true and (R) correctly explains (A).
4. (A) is false but (R) is true.
Subtopic: Introduction |
From NCERT
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In the given schematic representation of ethanol fermentation, the enzymes catalysing the step 2 and 3 respectively are:
| 1. | Pyruvate dehydrogenase and alcohol dehydrogenase |
| 2. | Pyruvic acid decarboxylase and alcohol dehydrogenase |
| 3. | Pyruvate dehydrogenase and alcohol decarboxylase |
| 4. | Pyruvic acid decarboxylase and alcohol decarboxylase |
Subtopic: Fermentation |
71%
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | It is very important to oxidise glucose not in one step but in several small steps in living cells. |
| Statement II: | Some steps can be just large enough such that the energy released can be coupled to ATP synthesis. |
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Introduction |
86%
From NCERT
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What purpose does fermentation serve?
l.
| 1. | Release of more than fifty per cent of the energy in glucose. |
| 2. | Traps energy released by incomplete oxidation of glucose as high energy bonds of ATP. |
| 3. | Regeneration of NAD+. |
| 4. | Production of highly useful acid or alcohol |
Subtopic: Fermentation |
83%
From NCERT
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How many of the given statements regarding Mitochondrial Electron Transport System (ETS) and Oxidative Phosphorylation are correct?
1. 2
2. 3
3. 4
4. 5
| I: | Ubiquinone receives reducing equivalents via FADH2 (complex II) and NADH dehydrogenase (complex I). |
| II: | The reduced ubiquinone (ubiquinol) is then oxidised with the transfer of electrons to cytochrome c via cytochrome bc1 complex (complex III). |
| III: | Cytochrome c is a small protein attached to the inner surface of the outer membrane. |
| IV: | Complex IV contains cytochromes a and a3, and two copper centres. |
| V: | Oxygen acts as the final hydrogen acceptor. |
1. 2
2. 3
3. 4
4. 5
Subtopic: ETS |
66%
From NCERT
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