MCQOPTIONS
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MCQOPTIONS
This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your Cell Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Energy that is released from glucose during respiration but not transferred to ATP bonds can be detected as |
| A. | CO2 |
| B. | AMP |
| C. | ADP |
| D. | heat |
| Answer» E. | |
| 2. |
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 | |
| 3. |
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 | |
| 4. |
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 | |
| 5. |
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 | |
| 6. |
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. | |
| 7. |
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. | |
| 8. |
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 | |
| 9. |
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 | |
| 10. |
Which one of the following is not the intermediate of Kreb's cycle? |
| A. | Isocitrate |
| B. | Succinate |
| C. | Fumarate |
| D. | Stearate |
| Answer» E. | |
| 11. |
Cholesterol can be synthesized de novo in |
| A. | pancreas |
| B. | intestine |
| C. | liver |
| D. | cell membrane |
| Answer» D. cell membrane | |
| 12. |
The first intermediate in TCA cycle is |
| A. | succinate |
| B. | fumerate |
| C. | citrate |
| D. | malate |
| Answer» D. malate | |
| 13. |
In eukaryotes, electron transport occurs in |
| A. | membranes and mitochondria |
| B. | endoplasmic reticulum |
| C. | cytoplasm |
| D. | all of the above |
| Answer» B. endoplasmic reticulum | |
| 14. |
How many ATPs are produced during citric acid cycle? |
| A. | 10 |
| B. | 13 |
| C. | 12 |
| D. | 8 |
| Answer» D. 8 | |
| 15. |
For each molecule of glucose, how many times does the TCA cycle proceed? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 16. |
The enzyme aconitase is responsible for ________________ |
| A. | polymerization |
| B. | degradation |
| C. | assembly |
| D. | isomerization |
| Answer» E. | |
| 17. |
In the TCA cycle, which of the following combines with Acetyl CoA to form a 6 carbon compound? |
| A. | oxaloacetate |
| B. | glucose |
| C. | pyruvate |
| D. | thiamine |
| Answer» B. glucose | |
| 18. |
Acetyl CoA is a _____________ carbon compound. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 19. |
Polysaccharides, fats and proteins break down into metabolites of __________________ |
| A. | Glycolysis |
| B. | TCA cycle |
| C. | RNA repair |
| D. | Membrane synthesis |
| Answer» C. RNA repair | |
| 20. |
Which of the following is an important end product of disassembly of fatty acids? |
| A. | Acetyl CoA |
| B. | Succinate dehydrogenase |
| C. | Pyruvate |
| D. | DNA gyrase |
| Answer» B. Succinate dehydrogenase | |
| 21. |
How many reactions that occur in the TCA cycle transfer electrons from a substrate to an electron accepting enzyme? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 22. |
Which of the following is also known as Krebs cycle? |
| A. | Electron transport chain |
| B. | Glycolysis |
| C. | TCA cycle |
| D. | DNA Replication |
| Answer» D. DNA Replication | |
| 23. |
All enzymes of the TCA cycle reside in the mitochondrial membrane. |
| A. | True |
| B. | False |
| Answer» C. | |