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Q. No.In glycolysis, NAD+ is reduced to NADH + H+:
1.
during conversion of 1,3 biphosphoglyceric acid to 3-phosphoglyceric acid
2.
during conversion of glyceraldehyde -3-phosphate to 1,3 biphosphoglyceric acid
3.
during conversion of glucose to glucose-6-phospate
4.
during conversion of 3-phosphoglyceric acid to 2-phosphoglycerate
Subtopic: Glycolysis |
79%
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Consider the given statements:
| Statement I: | In alcohol fermentation in yeast, pyruvic acid decarboxylase and alcohol dehydrogenase convert pyruvic acid to carbon dioxide and ethanol. |
| Statement II: | In lactic acid fermentation, lactate dehydrogenase reduces pyruvic acid to lactic acid and carbon dioxide in muscle cells during exercise. |
| 1. | Both Statement I and Statement II are correct |
| 2. | Both Statement I and Statement II are incorrect |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Fermentation |
55%
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During aerobic respiration, the complete oxidation of pyruvate by the stepwise removal of all the hydrogen atoms, leaving three molecules of carbon dioxide, takes place in the:
1. Cytosol
2. Mitochondrial matrix
3. Mitochondrial inter-membrane space
4. Inner mitochondrial membrane
1. Cytosol
2. Mitochondrial matrix
3. Mitochondrial inter-membrane space
4. Inner mitochondrial membrane
Subtopic: Aerobic Respiration |
74%
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After the two molecules of pyruvate, produced at the end of glycolysis from one molecule of glucose, enter the mitochondrial matrix and till the Krebs cycle is complete, which of the following will not be a correct number of the corresponding molecule produced?
| 1. | Eight molecules of NADH + H+ |
| 2. | Two molecules of FADH2 |
| 3. | Two molecules of ATP |
| 4. | Four molecules of carbon dioxide |
Subtopic: Aerobic Respiration |
63%
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Which complex in the mitochondrial electron transport system contains cytochromes a and a3 and two copper centres?
| 1. Complex I | 2. Complex II |
| 3. Complex III | 4. Complex IV |
Subtopic: ETS |
87%
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Consider the following statements regarding ATP synthase, complex V of the mitochondrial electron transport system:
1. Only III is correct
2. Only I and II are correct
3. I, II and III are correct
4. I, II and III are incorrect
| I: | The F1 headpiece is peripheral membrane protein complex and contains the site for the synthesis of ATP from ADP and inorganic phosphate. |
| II: | The F0 is an integral membrane protein complex that forms the channel through which protons cross the inner membrane. |
| III: | For each ATP produced, 4H+ passes through F0 from the intermembrane space to the matrix down the electrochemical proton gradient. |
2. Only I and II are correct
3. I, II and III are correct
4. I, II and III are incorrect
Subtopic: ETS |
56%
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Identify the incorrectly matched pair:
| Respiratory Complex | Pathway for electron transport | |
| 1. | NADH dehydrogenase | NADH – FMN – [Fe-S] – Q |
| 2. | Succinic dehydrogenase | FADH2 – FMN - Q |
| 3. | Cytochrome bc1 | Cyt b – [Fe-S] – Cyt c1 |
| 4. | Cytochrome c oxidase | CuA – Cyt a – Cyt a3 – CuB |
Subtopic: ETS |
57%
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Consider the two statements:
| Statement I: | The respiratory pathway is better regarded as an amphibolic pathway rather than only a catabolic pathway. |
| Statement II: | The respiratory pathway is involved in both anabolism and catabolism. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Amphibolic Nature of Respiration |
91%
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Consider the following statements:
1. Only II is incorrect
2. Only III is incorrect
3. Both I and III are incorrect
4. I, II and III are correct
| I: | If fatty acids were to be respired, they would enter the respiratory pathway as acetyl CoA. |
| II: | Glycerol enters the respiratory pathway after being converted to PGAL. |
| III: | Amino acids enter the respiratory pathway at some stage within the Krebs cycle but never as pyruvate or acetyl CoA. |
2. Only III is incorrect
3. Both I and III are incorrect
4. I, II and III are correct
Subtopic: Amphibolic Nature of Respiration |
74%
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The following equation shows the complete oxidation of tripalmitin [a fatty acid] during cellular respiration. Calculate the RQ:
\(2(C_{51}H_{98}O_6)+145O_2\longrightarrow \\102CO_2+98H_2O+\text{energy}\)
\(2(C_{51}H_{98}O_6)+145O_2\longrightarrow \\102CO_2+98H_2O+\text{energy}\)
| 1. | 0.7 | 2. | 0.9 |
| 3. | 1.0 | 4. | 4.0 |
Subtopic: Respiratory Quotient |
90%
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