MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Biotechnology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
During which phase of growth of Penicillium chrysogenum maximum antibiotic production takes place |
| A. | during the first phase |
| B. | during the second phase |
| C. | during the third phase |
| D. | same in all the phases |
| Answer» C. during the third phase | |
| 2. |
The yield of the antibiotic depends upon |
| A. | pH of the medium |
| B. | age of the inoculum |
| C. | composition of the medium |
| D. | all of these |
| Answer» E. | |
| 3. |
Which of the following event occurs during second phase of growth of P. chrysogenum? |
| A. | Synthesis of penicillin is high |
| B. | Mycelial mass increases |
| C. | pH increase |
| D. | Both (a) and (b) |
| Answer» E. | |
| 4. |
Inoculum preparation for the fermentation medium for penicillin takes place on |
| A. | wheat seeds |
| B. | barley seeds |
| C. | rice seeds |
| D. | all of these |
| Answer» C. rice seeds | |
| 5. |
Vegetable oil, (corn oil or soybean oil) added in the fermentation medium for penicillin, act as |
| A. | source of nutrients |
| B. | carbon source |
| C. | antifoam agent |
| D. | both (a) and (c) |
| Answer» D. both (a) and (c) | |
| 6. |
Which of the following organism(s) produce(s) tetracycline? |
| A. | <i>Steptomyces aureofaciens</i> |
| B. | <i>Steptomyces ramosus</i> |
| C. | <i>Nocardia sulphurea</i> |
| D. | All of these |
| Answer» E. | |
| 7. |
High yield of chlorotetracyclin requires |
| A. | no aeration |
| B. | continuous aeration |
| C. | aeration which does not affect the yield |
| D. | controlled aeration |
| Answer» C. aeration which does not affect the yield | |
| 8. |
At acidic pH, penicillin remains in |
| A. | aqueous phase |
| B. | solvent phase |
| C. | both (a) and (b) |
| D. | precipitates |
| Answer» C. both (a) and (b) | |
| 9. |
Chlorotetracyclin is soluble in |
| A. | organic solvents |
| B. | water |
| C. | ether |
| D. | all of these |
| Answer» C. ether | |
| 10. |
Penicillin is recovered after fermentation as |
| A. | potassium penicillin |
| B. | calcium penicillin |
| C. | sodium penicillin |
| D. | penicillin only |
| Answer» B. calcium penicillin | |
| 11. |
pH of the fermentation medium for chlorotetracyclins is |
| A. | 5-6 |
| B. | 6-7 |
| C. | 7-8 |
| D. | 8-9 |
| Answer» B. 6-7 | |
| 12. |
Antibiotics are typically produced in fed batch reactors because |
| A. | antibiotic yields are generally higher when cells enter the stationary phase |
| B. | the precursors are often toxic to the cells |
| C. | antibiotic yields are generally higher when cell growth slows |
| D. | All of the above |
| Answer» E. | |
| 13. |
Which of the following event occurs during third phase of growth of P chrysogenum? |
| A. | Concentration of antibiotic increases in the medium |
| B. | Autolysis of the medium starts |
| C. | Slight rise in pH due to liberation of ammonia |
| D. | All of the above |
| Answer» E. | |
| 14. |
At normal pH, penicillin remains in |
| A. | aqueous phase |
| B. | solvent phase |
| C. | both (a) and (b) |
| D. | precipitates |
| Answer» B. solvent phase | |
| 15. |
Which of the following precursor is added in the medium to get penicillin G? |
| A. | Phenyl carbamic acid |
| B. | Phenyl acetic acid |
| C. | Ammonium sulphate |
| D. | Ammonium chloride |
| Answer» C. Ammonium sulphate | |
| 16. |
Which of the following changes occur during first phase of growth of Penicillium chrysogenum? |
| A. | Growth of mycelia occurs |
| B. | Ammonia is liberated in the medium |
| C. | Lactic acid present in the corn steep liquor is utilized at the maximum rate |
| D. | All of the above |
| Answer» E. | |
| 17. |
Penicillin is produced by |
| A. | aerobic fermentation |
| B. | anaerobic fermentation |
| C. | aerobic fermentation followed by anaerobic fermentation |
| D. | anaerobic fermentation followed by aerobic fermentation |
| Answer» B. anaerobic fermentation | |
| 18. |
Media composition for the production of streptomycin is |
| A. | soybean meal, glucose, peptone, malt extract, sodium chloride |
| B. | soybean meal, glucose, peptone, malt extract, ammonium chloride |
| C. | soybean meal, glucose, peptone, malt extract, calcium carbonate |
| D. | soybean meal, glucose, peptone, malt extract, ammonium sulphate |
| Answer» B. soybean meal, glucose, peptone, malt extract, ammonium chloride | |
| 19. |
Streptomycin is produced by |
| A. | <i>S. griseus</i> |
| B. | <i>S. griseoflavus</i> |
| C. | <i>S. aerofaciens</i> |
| D. | <i>S. ramosus</i> |
| Answer» B. <i>S. griseoflavus</i> | |