MCQOPTIONS
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MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which among the following develop in the upper portion of the Winogradsky column? |
| A. | Sulfate-reducing bacteria |
| B. | Green-sulfur bacteria |
| C. | Purple-sulfur bacteria |
| D. | Thiobacilli |
| Answer» E. | |
| 2. |
The reduction of sulphates and sulphites to hydrogen sulphide is done by which group of bacteria? |
| A. | aerobic sulfate-reducing bacteria |
| B. | photosynthetic sulphur bacteria |
| C. | anaerobic sulphate-reducing bacteria |
| D. | heterotrophic bacteria |
| Answer» D. heterotrophic bacteria | |
| 3. |
The Winogradsky column experiment is done in the dark. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
Sulphates are reduced to hydrogen sulphide by _____________________ |
| A. | Desulfotomaculum sp. |
| B. | Thiobacillus thiooxidans |
| C. | Photosynthetic sulfur bacteria |
| D. | Rhodospirillum |
| Answer» B. Thiobacillus thiooxidans | |
| 5. |
Cysteine breaks down in presence of cysteine desulfurase to give _________________ |
| A. | oxaloacetic acid |
| B. | sulphuric acid |
| C. | pyruvic acid |
| D. | glyoxalate |
| Answer» D. glyoxalate | |
| 6. |
Which among the following are the most important agents for carbon dioxide fixation? |
| A. | bacteria |
| B. | fungi |
| C. | algae |
| D. | protozoa |
| Answer» D. protozoa | |
| 7. |
SULPHATES_ARE_REDUCED_TO_HYDROGEN_SULPHIDE_BY______________________?$ |
| A. | Desulfotomaculum sp. |
| B. | Thiobacillus thiooxidans |
| C. | Photosynthetic sulfur bacteria |
| D. | Rhodospirillum |
| Answer» B. Thiobacillus thiooxidans | |
| 8. |
The reduction of sulphates and sulphites to hydrogen sulphide is done by which group of bacteria?$ |
| A. | aerobic sulfate-reducing bacteria |
| B. | photosynthetic sulphur bacteria |
| C. | anaerobic sulphate-reducing bacteria |
| D. | heterotrophic bacteria |
| Answer» D. heterotrophic bacteria | |
| 9. |
The_Winogradsky_column_experiment_is_done_in_the_dark.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
Which among the following is a non-sulfur purple bacteria? |
| A. | Rhodomicrobium |
| B. | Thiobacillus |
| C. | Chromatium |
| D. | Chlorobium |
| Answer» B. Thiobacillus | |
| 11. |
Purple and green sulfur bacteria use ___________________ as the electron donor to reduce carbon dioxide. |
| A. | S<sup>2-</sup> |
| B. | SO4<sup>2-</sup> |
| C. | H<sup>2</sup>S |
| D. | Organic acids |
| Answer» D. Organic acids | |
| 12. |
Which among the following develop in the upper portion of the Winogradsky column? |
| A. | Sulfate-reducing bacteria |
| B. | Green-sulfur bacteria |
| C. | Purple-sulfur bacteria |
| D. | Thiobacilli |
| Answer» E. | |
| 13. |
Which of the following processes is performed by Thiobacillus thiooxidans? |
| A. | converting sulphur to sulphates |
| B. | converting sulphur to sulphides |
| C. | converting sulphur to sulphites |
| D. | converting organic sulphur to inorganic sulphur |
| Answer» B. converting sulphur to sulphides | |
| 14. |
Cysteine breaks down in presence of cysteine desulfurase to give _________________ |
| A. | oxaloacetic acid |
| B. | sulphuric acid |
| C. | pyruvic acid |
| D. | glyoxalate |
| Answer» D. glyoxalate | |
| 15. |
Cellobiose is metabolized directly by many microorganisms. |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
In carbon cycle flow of energy is _________________ |
| A. | bidirectional |
| B. | linear |
| C. | cyclic |
| D. | irreversible |
| Answer» C. cyclic | |
| 17. |
The amount of organic material in the forest soil remains approximately the same from year to year. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
Cellulose is degraded to cellobiose by the enzyme __________________ |
| A. | cellulase |
| B. | beta-glucosidase |
| C. | hexokinase |
| D. | cellulose dehydrogenase |
| Answer» B. beta-glucosidase | |
| 19. |
Fresh air contains approximately ______ percent carbon dioxide by volume. |
| A. | 0.01 |
| B. | 2 |
| C. | 5 |
| D. | 0.03 |
| Answer» E. | |
| 20. |
Which among the following are the most important agents for carbon dioxide fixation? |
| A. | bacteria |
| B. | fungi |
| C. | algae |
| D. | protozoa |
| Answer» D. protozoa | |