MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
FAD is reduced to FADH during |
| A. | electron transport phosphorylation |
| B. | lactate fermentation |
| C. | Krebs cycle |
| D. | glycolysis |
| Answer» D. glycolysis | |
| 2. |
How many CO molecules are exhaled for each O molecule utilized in cellular respiration? |
| A. | 1 |
| B. | 3 |
| C. | 6 |
| D. | 12 |
| Answer» B. 3 | |
| 3. |
In electron transport, electrons ultimately pass to |
| A. | ADP |
| B. | cytochrome b |
| C. | oxygen |
| D. | none of these |
| Answer» D. none of these | |
| 4. |
During electron transport, protons are pumped out of the mitochondrion at each of the major sites except for |
| A. | <i>complex I</i> |
| B. | <i>complex II</i> |
| C. | <i>complex III</i> |
| D. | <i>complex IV</i> |
| Answer» C. <i>complex III</i> | |
| 5. |
The aerobic breakdown of glucose known as respiration involves |
| A. | electron transport phosphorylation |
| B. | glycolysis |
| C. | Krebs Cycle |
| D. | all of the above |
| Answer» E. | |
| 6. |
Which of the following is not a feature of oxidative phosphorylation? |
| A. | Direct transfer of phosphate from a substrate molecule to ADP |
| B. | An electrochemical gradient across the inner mitochondrial membrane |
| C. | A membrane bound ATP synthase |
| D. | A protonmotive force |
| Answer» B. An electrochemical gradient across the inner mitochondrial membrane | |
| 7. |
How many CO2 molecules are exhaled for each O2 molecule utilized in cellular respiration? |
| A. | 1 |
| B. | 3 |
| C. | 6 |
| D. | 12 |
| Answer» B. 3 | |
| 8. |
What happens after glycolysis when oxygen is available as an electron acceptor? |
| A. | Pyruvate is formed |
| B. | NADH is produced |
| C. | Fermentation |
| D. | Oxidative phosphorylation |
| Answer» C. Fermentation | |
| 9. |
FAD is reduced to FADH2 during |
| A. | electron transport phosphorylation |
| B. | lactate fermentation |
| C. | Krebs cycle |
| D. | glycolysis |
| Answer» D. glycolysis | |
| 10. |
During glycolysis, electrons removed from glucose are passed to |
| A. | FAD |
| B. | NAD |
| C. | <sup>+</sup> |
| D. | acetyl CoA |
| E. | pyruvic acid |
| Answer» C. <sup>+</sup> | |
| 11. |
Coenzyme Q is involved in electron transport as |
| A. | directly to O |
| B. | <sub>2</sub> |
| C. | a water-soluble electron donor |
| D. | covalently attached cytochrome cofactor |
| E. | a lipid-soluble electron carrier |
| Answer» E. a lipid-soluble electron carrier | |
| 12. |
The carbon dioxide is primary a product of |
| A. | Krebs cycle |
| B. | glycolysis |
| C. | electron transport phosphorylation. |
| D. | lactate fermentation. |
| Answer» B. glycolysis | |
| 13. |
In aerobic respiration, the compound that enters a mitochondrion is |
| A. | acetyl CoA |
| B. | pyruvate |
| C. | phosphoglyceraldehyde |
| D. | oxaloacetate |
| Answer» C. phosphoglyceraldehyde | |
| 14. |
A biological redox reaction always involves |
| A. | an oxidizing agent |
| B. | a gain of electrons |
| C. | a reducing agent |
| D. | all of these |
| Answer» E. | |
| 15. |
Which of the following is correct sequence of processes in the oxidation of glucose? |
| A. | Krebs cycle - glycolysis - electron transport |
| B. | Glycolysis - Krebs cycle - eletron transport |
| C. | Electron transport - Krebs cycle - glycolysis |
| D. | Krebs cycle - electron transport - glycolysis |
| Answer» C. Electron transport - Krebs cycle - glycolysis | |
| 16. |
The complete oxidation of glucose yields usable energy in the form of |
| A. | FADH |
| B. | <sub>2</sub> |
| C. | coenzyme A |
| D. | ATP |
| E. | pyruvic acid |
| Answer» D. ATP | |