Q. No.The three sequential steps of aerobic respiration are:
| 1. | Glycolysis – Krebs cycle – Oxidative phosphorylation |
| 2. | Krebs cycle – Glycolysis – Oxidative phosphorylation |
| 3. | Glycolysis – Oxidative phosphorylation – Krebs cycle |
| 4. | Oxidative phosphorylation – Glycolysis – Krebs cycle |
Subtopic: Glycolysis | Aerobic Respiration | Kreb's Cycle | ETS |
79%
Level 2: 60%+
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Which enzyme is involved in the transfer of electrons from NADH to ubiquinone in the ETS?
| 1. | Succinate dehydrogenase |
| 2. | Cytochrome oxidase |
| 3. | NADH dehydrogenase |
| 4. | ATP synthase |
Subtopic: ETS |
72%
Level 2: 60%+
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Regarding ATP synthase:
| 1. | Both F₀ and F₁ directly oxidise NADH to produce ATP. |
| 2. | F₁ forms the proton channel, and F₀ is the catalytic site for ATP synthesis. |
| 3. | F₀ forms channel through which protons pass, and F₁ functions as catalytic site for ATP synthesis. |
| 4. | F₀ hydrolyses ATP while F₁ pumps protons into the intermembrane space. |
Subtopic: ETS |
86%
Level 1: 80%+
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Oxidative phosphorylation refers to:
| 1. | Direct transfer of phosphate group in substrate-level phosphorylation |
| 2. | Formation of ATP using the energy released by oxidation of reduced coenzymes |
| 3. | Conversion of ADP to ATP in glycolysis only |
| 4. | Hydrolysis of ATP to release energy |
Subtopic: ETS |
84%
Level 1: 80%+
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The immediate source of energy for ATP synthesis in oxidative phosphorylation is:
| 1. | Transfer of electrons to oxygen |
| 2. | Proton gradient across the inner mitochondrial membrane |
| 3. | Hydrolysis of glucose to pyruvate |
| 4. | Substrate-level phosphorylation in glycolysis |
Subtopic: ETS |
64%
Level 2: 60%+
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In the mitochondrial electron transport system, oxygen acts as the final electron acceptor. Which of the following is the correct fate of oxygen?
| 1. | Oxygen is directly converted into ATP |
| 2. | Oxygen oxidises glucose to pyruvate |
| 3. | Oxygen is reduced to NADH and FADH₂ |
| 4. | Oxygen combines with protons and electrons to form water |
Subtopic: ETS |
92%
Level 1: 80%+
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Succinate dehydrogenase in the Krebs cycle has a unique property compared to other enzymes of the cycle. Which of the following describes it correctly?
| 1. | It is the only enzyme that reduces NAD⁺ to NADH. |
| 2. | It is the only enzyme that produces ATP directly in the matrix. |
| 3. | It is the only enzyme located in the inner mitochondrial membrane and directly linked to the ETS. |
| 4. | It is the only enzyme that catalyses substrate-level phosphorylation. |
Subtopic: ETS |
66%
Level 2: 60%+
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The ultimate electron acceptor in the mitochondrial electron transport chain is:
1. Cytochrome c
2. Oxygen
3. ATP synthase
4. Ubiquinone
1. Cytochrome c
2. Oxygen
3. ATP synthase
4. Ubiquinone
Subtopic: ETS |
83%
Level 1: 80%+
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The series of protein complexes that transfer electrons from NADH and FADH₂ to oxygen are embedded in the __________.
1. Inner mitochondrial membrane2. Mitochondrial matrix
3. Outer mitochondrial membrane
4. Cristae
Subtopic: ETS |
85%
Level 1: 80%+
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The high-energy electrons from NADH and FADH₂ are delivered to the __________ for oxidative phosphorylation.
1. Electron Transport Chain
2. Outer mitochondrial membrane
3. Mitochondrial matrix
4. Cristae
Subtopic: ETS |
90%
Level 1: 80%+
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