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Q. No.
Assertion (A):
In general, organic molecules that have an abundance of hydrogen are excellent energy fuels for living organisms.
Reason (R):
Bonds in such organic molecules are source of high energy electrons.
1.
Both (A) and (R) are true and the (R) is the correct explanation of the (A).
2.
Both (A) and (R) are true but the (R) is not the correct explanation of the (A).
3.
(A) is true but (R) is false.
4.
Both (A) and (R) are false.
Subtopic: Glycolysis |
73%
Level 2: 60%+
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| Assertion(A): | NAD+ is the most versatile electron acceptor in cellular respiration and functions in several of redox steps during the breakdown of glucose. |
| Reason(R): | As an electron acceptor, NAD+ functions as an oxidizing agent during respiration. |
| 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. | Both (A) and (R) are false. |
Subtopic: ETS |
Level 3: 35%-60%
Please attempt this question first.
Hints
| Assertion(A): | The reaction in glycolysis, catalyzed by the enzyme phosphofructokinase, is a key regulatory point and also a rate limiting step. |
| Reason(R): | The reaction is essentially irreversible. |
| 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 the (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Glycolysis | Glycolysis Regulation |
52%
Level 3: 35%-60%
Please attempt this question first.
Hints
| Assertion (A): | Arsenate is the uncoupler of glycolysis. |
| Reason (R): | Arsenate is an inhibitor of phosphoglycerate mutase. |
| 1. | Both (A) and (R) are true and the reason is the correct explanation of the (A). |
| 2. | Both (A) and (R) are true but the reason is not the correct explanation of the (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Glycolysis |
Level 4: Below 35%
Please attempt this question first.
Hints
| Assertion(A): | The carbons lost as \(CO_2\) in the Krebs cycle come directly from acetyl CoA. |
| Reason(R): | These carbons are lost always and cannot be put to any use. |
| 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. | Both (A) and (R) are false. |
Subtopic: Kreb's Cycle |
Level 3: 35%-60%
| Assertion(A): | Cyanide poisoning is a form of histotoxic hypoxia. |
| Reason(R): | Cyanide binds to iron of cytochrome c oxidase and thus prevents binding of oxygen to hemoglobin. |
| 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. | Both (A) and (R) are false. |
Subtopic: Electron Transport Inhibitors |
Level 4: Below 35%
Consider the given two statements:
| Assertion (A): | Homolactic fermentation (producing only lactic acid) is the simplest type of fermentation. |
| Reason (R): | It is one of the only respiration processes to not produce a gas as a byproduct. |
| 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, (R) is False. |
| 4. | (A) is False, (R) is True. |
Subtopic: Fermentation |
50%
Level 3: 35%-60%
| Assertion (A): | When a glucose fed yeast is transferred from aerobic to anaerobic medium its rate of glucose consumption decreases. |
| Reason (R): | It starts metabolizing lactose and stops using glucose in anaerobic conditions. |
| 1. | Both (A) and (R) are true and the reason is the correct explanation of the (A). |
| 2. | Both (A) and (R) are true but the reason is not the correct explanation of the (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Fermentation |
Level 4: Below 35%
Based on the information given in Section 14.3 of your NCERT textbook, can you identify the chemical reaction catalyzed by the enzyme alcohol dehydrogenase?
1.
2.
3.
4. None of these
Subtopic: Fermentation |
69%
Level 2: 60%+
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Oxidation of organic compounds by molecular oxygen results in the production of carbon dioxide and water and releases free energy. This is because:
| 1. | High energy covalent bonds in organic molecules are broken to produce weaker covalent bonds in water and carbon dioxide. |
| 2. | Electrons are being moved from atoms that have a lower affinity for electrons to atoms with a higher affinity for electrons. |
| 3. | The electrons in water and carbon dioxide have higher potential energy than the electrons in organic compounds. |
| 4. | The covalent bonds in organic molecules are unstable and stable in water and oxygen. |
Subtopic: ETS |
Level 3: 35%-60%
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