MCQOPTIONS
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MCQOPTIONS
This section includes 27 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How many oxygen molecules are required in the fermentation of one molecule of glucose to ethanol and CO? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 36 |
| Answer» B. 1 | |
| 2. |
In cellular metabolism, O is used |
| A. | to provide electrons for photophosphorylation |
| B. | in glycolysis |
| C. | as a terminal electron acceptor |
| D. | in the Krebs cycle |
| Answer» D. in the Krebs cycle | |
| 3. |
Organisms can synthesize ATP by oxidative phosphorylation when they |
| A. | ferment |
| B. | oxidize glucose to pyruvate |
| C. | pass electrons from the oxidation of chlorophyll through an electron transport system |
| D. | pass electrons to oxygen through an electron transport system containing cytochromes |
| Answer» E. | |
| 4. |
How many molecules of carbon dioxide will be given off during ten turns of the Krebs cycle? |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 40 |
| Answer» C. 30 | |
| 5. |
In cellular metabolism, O2 is used |
| A. | to provide electrons for photophosphorylation |
| B. | in glycolysis |
| C. | as a terminal electron acceptor |
| D. | in the Krebs cycle |
| Answer» D. in the Krebs cycle | |
| 6. |
The enzymes that catalyze the reactions of the Krebs cycle are found in which subcellular organelle of eukaryotes? |
| A. | Mitochondrion |
| B. | Chloroplast |
| C. | Ribosome |
| D. | Endoplasmic reticulum |
| Answer» B. Chloroplast | |
| 7. |
Fatty acids are oxidized to acetyl-CoA by which of the following pathways? |
| A. | -oxidation |
| B. | Entner-Doudoroff |
| C. | pentose phosphate pathway |
| D. | Embden-Meyerhof pathway |
| Answer» B. Entner-Doudoroff | |
| 8. |
In anaerobic respiration, the final electron acceptor can be |
| A. | oxygen |
| B. | nitrate |
| C. | pyruvate |
| D. | acetyl-CoA |
| Answer» C. pyruvate | |
| 9. |
Which one of the following is not produced in any of the steps of glycolysis? |
| A. | NAD |
| B. | <sup>+</sup> |
| C. | NADH |
| D. | ADP |
| E. | ATP |
| Answer» B. <sup>+</sup> | |
| 10. |
The number of ATP molecules produced from one glucose molecule by a bacterium producing lactic acid is |
| A. | greater than producing ethanol |
| B. | lesser than producing ethanol |
| C. | approximately equal to producing ethanol |
| D. | none of these |
| Answer» D. none of these | |
| 11. |
Most bacterial fermentations yield how many net ATP molecules per molecule of glucose? |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 12. |
The amount of ATP produced by a cell from glucose when metabolizing it by fermentation means is |
| A. | greater than by aerobic metabolism |
| B. | lesser than by aerobic metabolism |
| C. | exactly or approximately equal to by aerobic metabolism |
| D. | none of these |
| Answer» C. exactly or approximately equal to by aerobic metabolism | |
| 13. |
Which one of the following is produced in the greatest numbers during one turn of the Krebs cycle? |
| A. | NADH |
| B. | Acetyl-CoA |
| C. | FADH |
| D. | <sub>2</sub> |
| E. | ATP |
| Answer» B. Acetyl-CoA | |
| 14. |
Which of the following is accomplished in chemiosmosis? |
| A. | The oxidation of ATP |
| B. | The oxidation of water |
| C. | The oxidation of NADH |
| D. | The oxidation of CO |
| E. | <sub>2</sub> |
| Answer» D. The oxidation of CO | |
| 15. |
A yeast or fungal cell produces how many net ATP molecules per molecule of glucose when completely oxidized? |
| A. | 32 |
| B. | 34 |
| C. | 36 |
| D. | 38 |
| Answer» D. 38 | |
| 16. |
Before most molecules can enter the Krebs citric acid cycle, they must be converted to |
| A. | citric acid |
| B. | oxaloacetic acid |
| C. | NADH or FADH |
| D. | acetyl-CoA |
| Answer» E. | |
| 17. |
How many oxygen molecules are required in the fermentation of one molecule of glucose to ethanol and CO2? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 36 |
| Answer» B. 1 | |
| 18. |
The amount of energy (cal/mole) in an ATP molecule produced by a cell from glucose by fermentation is |
| A. | greater than aerobic metabolism |
| B. | less than aerobic metabolism |
| C. | exactly or approximately equal to aerobic metabolism |
| D. | none of the above |
| Answer» D. none of the above | |
| 19. |
Glucose can be broken down to pyruvate by |
| A. | Entner-Doudoroff pathway |
| B. | tricarboxylic acid cycle |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» B. tricarboxylic acid cycle | |
| 20. |
Aerobic respiration differs from anaerobic respiration in which of the following respects? |
| A. | Anaerobic respiration is glycolysis |
| B. | Aerobic respiration requires the electron transport chain |
| C. | The final electron acceptors are different |
| D. | Aerobic respiration produces less ATP |
| Answer» D. Aerobic respiration produces less ATP | |
| 21. |
In lactic acid fermentation, the final electron acceptor would be |
| A. | fructose |
| B. | pyruvate |
| C. | glucose |
| D. | acetyl-CoA |
| Answer» C. glucose | |
| 22. |
The amount of ATP that can be obtained by complete oxidation of a glucose by a bacterium is |
| A. | greater than by a yeast cell |
| B. | lesser than by a yeast cell |
| C. | exactly or approximately equal to by a yeast cell |
| D. | none of these |
| Answer» B. lesser than by a yeast cell | |
| 23. |
The final electron acceptor in the electron transport chain is |
| A. | CoQ |
| B. | a cytochrome |
| C. | FMN |
| D. | oxygen |
| Answer» E. | |
| 24. |
The enzymes for glycolysis are located |
| A. | on the inner surface of the cell membrane |
| B. | on the inner membrane of the mitochondrion |
| C. | on the outer membrane of the chloroplast |
| D. | in the cytoplasm |
| Answer» E. | |
| 25. |
Suppose a eukaryotic cell had a mutation that prevented the production of cytochrome c. As a result of this mutation, which of the following processes would not occur? |
| A. | Cellular respiration |
| B. | Photosynthesis |
| C. | Mitosis |
| D. | Cell wall synthesis |
| Answer» B. Photosynthesis | |
| 26. |
In glycolysis, ATP is created by |
| A. | photophosphorylation |
| B. | the chemiosmotic mechanism |
| C. | substrate level phosphorylation |
| D. | the pentose phosphate pathway |
| Answer» D. the pentose phosphate pathway | |
| 27. |
For each pair of electrons passing from NADH located inside the mitochondria to oxygen, how many ATP molecules can be generated? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |