MCQOPTIONS
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MCQOPTIONS
This section includes 28 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The FADH and NADH produced by the oxidation of one acetyl-CoA results in the synthesis of about- |
| A. | 3 ATPs |
| B. | 6 ATPs |
| C. | 11 ATPs |
| D. | 15 ATPs |
| Answer» D. 15 ATPs | |
| 2. |
Cholesterol can be synthesized in |
| A. | pancreas |
| B. | intestine |
| C. | liver |
| D. | cell membrane |
| Answer» D. cell membrane | |
| 3. |
The catabolism of sugars and fatty acids is similar because |
| A. | both of these compounds are funnelled through the TC A/citric acid cycle |
| B. | both of these compounds generate redox energy during catabolism |
| C. | both of these compounds generate chemical energy during catabolism |
| D. | all of the above |
| Answer» B. both of these compounds generate redox energy during catabolism | |
| 4. |
Which one of the following is not the intermediate of Kreb's cycle? |
| A. | Isocitrate |
| B. | Succinate |
| C. | Fumarate |
| D. | Stearate |
| Answer» E. | |
| 5. |
Which one is not the main protein in electron transport chain? |
| A. | NADH dehydrogenase |
| B. | Cytochrome bc1 complex |
| C. | Cytochrome oxidase |
| D. | Citrate synthease |
| Answer» E. | |
| 6. |
Important function of cholesterol is to |
| A. | modulate fluidity |
| B. | enhance blood circulation |
| C. | prevent bile salts formation |
| D. | None of these |
| Answer» B. enhance blood circulation | |
| 7. |
The enzymes of the TCA cycle in a eukaryotic cell are located in the |
| A. | nucleus |
| B. | mitochondria |
| C. | plasma membrane |
| D. | lysosomal bodies |
| Answer» C. plasma membrane | |
| 8. |
Citric acid cycle occurs in |
| A. | cytoplasm |
| B. | mitochondria |
| C. | endoplasmic reticulum |
| D. | golgi bodies |
| Answer» C. endoplasmic reticulum | |
| 9. |
How many ATPs are produced during citric acid cycle? |
| A. | 10 |
| B. | 13 |
| C. | 12 |
| D. | 8 |
| Answer» D. 8 | |
| 10. |
During cellular respiration, most of the ATP made, is generated by |
| A. | oxidative phosphorylation |
| B. | photophosphorylation |
| C. | glycolysis |
| D. | substrate-level phosphorylation |
| Answer» B. photophosphorylation | |
| 11. |
Standard redox potential for a substance is measured under standard condition and is expressed as |
| A. | mili-Ampere |
| B. | Volt |
| C. | without unit |
| D. | Ohm |
| Answer» C. without unit | |
| 12. |
The end product of glycolysis is pyruvate, which enters the citric acid cycle after being converted to |
| A. | acetic acid |
| B. | acetyl-CoA |
| C. | acetaldehyde |
| D. | none of these |
| Answer» C. acetaldehyde | |
| 13. |
The FADH2 and NADH produced by the oxidation of one acetyl-CoA results in the synthesis of about- |
| A. | 3 ATPs |
| B. | 6 ATPs |
| C. | 11 ATPs |
| D. | 15 ATPs |
| Answer» D. 15 ATPs | |
| 14. |
In eukaryotes, electron transport occurs in |
| A. | membranes and mitochondria |
| B. | endoplasmic reticulum |
| C. | cytoplasm |
| D. | all of the above |
| Answer» B. endoplasmic reticulum | |
| 15. |
Energy that is released from glucose during respiration but not transferred to ATP bonds can be detected as |
| A. | CO |
| B. | <sub>2</sub> |
| C. | AMP |
| D. | ADP |
| E. | heat |
| Answer» E. heat | |
| 16. |
Cholesterol can be synthesized de novo in |
| A. | pancreas |
| B. | intestine |
| C. | liver |
| D. | cell membrane |
| Answer» D. cell membrane | |
| 17. |
Most multi-cellular organisms obtain energy for the synthesis of ATP during oxidative phosphorylation from |
| A. | high energy phosphate compounds |
| B. | a proton gradient across the inner mitochondrial membrane |
| C. | a proton gradient across the cell membrane |
| D. | a proton gradient across the outer mitochondrial membrane |
| Answer» C. a proton gradient across the cell membrane | |
| 18. |
A positive redox potential means substance has |
| A. | lower affinity for electron |
| B. | higher affinity for electron |
| C. | lower affinity for proton |
| D. | higher affinity for proton |
| Answer» C. lower affinity for proton | |
| 19. |
How many molecules of ATPs are synthesized per NADH oxidation? |
| A. | 2 |
| B. | 1 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 20. |
Why is the TCA cycle the central pathway of metabolism of the cell? |
| A. | It occurs in the center of the cell |
| B. | Its intermediates are commonly used by other metabolic reactions |
| C. | All other metabolic pathways depend upon it |
| D. | None of the above |
| Answer» C. All other metabolic pathways depend upon it | |
| 21. |
Malate-asparatate shuttle operates in |
| A. | lungs and liver |
| B. | heart and liver |
| C. | pancreas and liver |
| D. | none of these |
| Answer» C. pancreas and liver | |
| 22. |
Oxidation of a molecule involves |
| A. | gain of electron |
| B. | loss of electron |
| C. | gain of proton |
| D. | loss of proton |
| Answer» C. gain of proton | |
| 23. |
Which of the following enzyme does not take part in the TCA cycle? |
| A. | Citrate synthase |
| B. | Iso-citrate dehydrogenase |
| C. | Pyruvate dehydrogenase |
| D. | Malate dehydrogenase |
| Answer» D. Malate dehydrogenase | |
| 24. |
The first intermediate in TCA cycle is |
| A. | succinate |
| B. | fumerate |
| C. | citrate |
| D. | malate |
| Answer» D. malate | |
| 25. |
Most of the enzymes of the citric acid cycle in a eukaryotic cell are located in the |
| A. | inner mitochondrial membrane |
| B. | cytosol |
| C. | mitochondrial matrix |
| D. | intermembrane space |
| Answer» D. intermembrane space | |
| 26. |
Which of the following is involved in energy production? |
| A. | Generation of proton gradients across membranes |
| B. | Transport of electrons on organic molecules |
| C. | Conversion of compounds with high energy to those of low energy |
| D. | All of the above |
| Answer» E. | |
| 27. |
In what form does the product of glycolysis enter the TCA cycle? |
| A. | AcetylCoA |
| B. | Pyruvate |
| C. | NADH |
| D. | Glucose |
| Answer» B. Pyruvate | |
| 28. |
To stop ATP synthesis which chemical is generally used? |
| A. | DNSA |
| B. | 2,4 dinitrophenol |
| C. | DDT |
| D. | None of the chemical can stop ATP synthesis |
| Answer» C. DDT | |