MCQOPTIONS
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MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In electron transport, electrons ultimately pass to |
| A. | ADP |
| B. | cytochrome b |
| C. | oxygen |
| D. | none of these |
| Answer» D. none of these | |
| 2. |
During electron transport, protons are pumped out of the mitochondrion at each of the major sites except for |
| A. | complex I |
| B. | complex II |
| C. | complex III |
| D. | complex IV |
| Answer» C. complex III | |
| 3. |
Which effects the increased levels of hydrogen ions in the inter-membrane space of the mitochondria? |
| A. | Increase ATP production |
| B. | Decreased levels of oxidative phosphorylation |
| C. | Increased levels of water in inter-membrane space |
| D. | Decreased levels of chemiosmosis |
| Answer» B. Decreased levels of oxidative phosphorylation | |
| 4. |
Products of glucose oxidation essential for oxidative phosphorylation are ____________ |
| A. | Pyruvate |
| B. | Acetyl co-A |
| C. | NADPH and ATP |
| D. | NADH and FADH2 |
| Answer» E. | |
| 5. |
NADP+ in its reduced form is ____________ |
| A. | NAD |
| B. | NADH |
| C. | NADPH |
| D. | DPH |
| Answer» D. DPH | |
| 6. |
NADP is a cofactor used in ____________ |
| A. | Catabolic reactions |
| B. | Anabolic reactions |
| C. | Elimination reaction |
| D. | Redox reactions |
| Answer» C. Elimination reaction | |
| 7. |
In metabolism, NAD is involved in ____________ |
| A. | Spontaneous reaction |
| B. | Elimination reaction |
| C. | Redox reactions |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 8. |
The magnitude of proton motive force depends on ____________ |
| A. | Energy charge of cell |
| B. | Permeability of membrane |
| C. | Number of ribosomes in cell |
| D. | None of the mentioned |
| Answer» B. Permeability of membrane | |
| 9. |
What is the rate of electron transfer when proton motive force is high? |
| A. | Faster |
| B. | Slower |
| C. | Moderate |
| D. | None |
| Answer» C. Moderate | |
| 10. |
The regulation of oxidative phosphorylation depends on ____________ |
| A. | Magnitude of ion motive force |
| B. | Magnitude of electron motive force |
| C. | Magnitude of proton motive force |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 11. |
PRODUCTS_OF_GLUCOSE_OXIDATION_ESSENTIAL_FOR_OXIDATIVE_PHOSPHORYLATION_ARE?$ |
| A. | Pyruvate |
| B. | Acetyl co-A |
| C. | NADPH and ATP |
| D. | NADH and FADH<sub>2</sub> |
| Answer» E. | |
| 12. |
The_effect_of_increased_levels_of_hydrogen_ions_in_the_inter-membrane_space_of_the_mitochondria_is$ |
| A. | Increase ATP production |
| B. | Decreased levels of oxidative phosphorylation |
| C. | Increased levels of water in inter-membrane space |
| D. | Decreased levels of chemiosmosis |
| Answer» B. Decreased levels of oxidative phosphorylation | |
| 13. |
NADP+ in its reduced form i? |
| A. | NAD |
| B. | NADH |
| C. | NADPH |
| D. | None |
| Answer» D. None | |
| 14. |
What is the proportion of ATP produced by oxidative phosphorylation? |
| A. | 60% |
| B. | 70% |
| C. | 80% |
| D. | 90% |
| Answer» B. 70% | |
| 15. |
NADP is a cofactor used in |
| A. | Catabolic reactions |
| B. | Anabolic reactions |
| C. | Elimination reaction |
| D. | Redox reactions |
| Answer» C. Elimination reaction | |
| 16. |
In metabolism, NAD is involved in |
| A. | Spontaneous reaction |
| B. | Elimination reaction |
| C. | Redox reactions |
| D. | None |
| Answer» D. None | |
| 17. |
Where does oxidative phosphorylation take place? |
| A. | Ribosomes |
| B. | Nucleus |
| C. | Mitochondria |
| D. | Cell membrane |
| Answer» D. Cell membrane | |
| 18. |
The magnitude of proton motive force depends on |
| A. | Energy charge of cell |
| B. | Permeability of membrane |
| C. | Number of ribosomes in cell |
| D. | None |
| Answer» B. Permeability of membrane | |
| 19. |
The rate of electron transfer when proton motive force is high is |
| A. | Faster |
| B. | Slower |
| C. | Moderate |
| D. | None |
| Answer» C. Moderate | |
| 20. |
The regulation of oxidative phosphorylation depends on |
| A. | Magnitude of ion motive force |
| B. | Magnitude of electron motive force |
| C. | Magnitude of proton motive force |
| D. | None |
| Answer» D. None | |