Q. No.In the citric acid cycle:
1.
oxygen is used to oxidise the acetyl group carbons of acetyl-CoA in the citric acid cycle.
2.
three molecules of NADH and one molecule of FADH2 are produced in one turn.
3.
oxygen is not used, so the cycle can occur in anaerobic conditions.
4.
water is formed during the complete oxidation of glucose.
Pyruvate dehydrogenase activity during aerobic respiration requires:
| 1. | Calcium | 2. | Iron |
| 3. | Cobalt | 4. | Magnesium |
In lactate fermentation, the final electron acceptor is:
| 1. | NAD+ | 2. | pyruvate |
| 3. | O2 | 4. | lactic acid |
Ubiquinone is:
| 1. | a protein in the mitochondrial electron transport chain |
| 2. | a substrate for synthesis of FADH |
| 3. | a vitamin used as coenzyme in Krebs cycle |
| 4. | a small hydrophobic coenzyme |
The correct chronological sequence of the stages of the glycolytic pathway is:
| 1. | glucose priming, cleavage and rearrangement, oxidation, ATP generation |
| 2. | cleavage and rearrangement, glucose priming, ATP generation, oxidation |
| 3. | glucose priming, oxidation, cleavage and rearrangement, ATP generation |
| 4. | ATP generation, oxidation, glucose priming, cleavage and rearrangement |
Identify the incorrectly matched pair:
| Component of ETC | Name | |
| 1. | Complex I | NADH dehydrogenase |
| 2. | Complex II | Succinate dehydrogenase |
| 3. | Complex III | Cytochrome b6f complex |
| 4. | Complex IV | Cytochrome c oxidase |
ATP synthesis during oxidative phosphorylation in mitochondria is directly driven by:
| 1. | oxidation of glucose. |
| 2. | electron transport downhill in the ETC. |
| 3. | terminal transfer of electrons to oxygen. |
| 4. | chemiosmosis. |
When electron pass downhill in the ETC, the energy released is used to pump protons into:
1. matrix of mitochondria
2. cytosol
3. mitochondrial inner membrane
4. mitochondrial intermembrane space
The correct sequence of flow of electrons downhill in the mitochondrial electron transport chain would be:
1. ubiquinone, cytochromes, FMN, Fe-S
2. cytochromes, FMN, ubiquinone, Fe-S
3. Fe-S, FMN, cytochromes, ubiquinone
4. FMN, Fe-S, ubiquinone, cytochromes
Krebs cycle is also called as:
| 1. | glycolysis | 2. | fermentation |
| 3. | Calvin cycle | 4. | the citric acid cycle |
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