MCQOPTIONS
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MCQOPTIONS
This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Tyrocidines are more effective against ___________________ |
| A. | Gram-positive organisms |
| B. | Gram-negative organisms |
| C. | Mycoplasmas |
| D. | Spirochetes |
| Answer» B. Gram-negative organisms | |
| 2. |
Which of the following inhibits protein synthesis by combining with the 50S subunit ribosome? |
| A. | Streptomycin |
| B. | Tetracycline |
| C. | Chloramphenicol |
| D. | Penicillin |
| Answer» D. Penicillin | |
| 3. |
Antibiotic produced by Streptomyces rimosus is _______________ |
| A. | chlortetracycline |
| B. | oxytetracycline |
| C. | tetracycline |
| D. | doxycycline |
| Answer» C. tetracycline | |
| 4. |
Streptomycin is produced by which of the following organisms? |
| A. | Stretomyces noursei |
| B. | Streptomyces nodosus |
| C. | Streptomyces fradiae |
| D. | Streptomyces griseus |
| Answer» E. | |
| 5. |
Polymyxins inhibits the growth of the microbes by carrying out which of the following actions? |
| A. | inhibition of cell-wall synthesis |
| B. | damage to cytoplasmic membrane |
| C. | inhibition of nucleic acid and protein synthesis |
| D. | inhibition of specific enzyme systems |
| Answer» C. inhibition of nucleic acid and protein synthesis | |
| 6. |
Which of the following interferes with the regeneration of the monophosphate form of bactoprenol from the pyrophosphate form? |
| A. | Vancomycin |
| B. | Ampicillin |
| C. | Bacitracin |
| D. | Cephalosporins |
| Answer» D. Cephalosporins | |
| 7. |
Streptomyces orientalis produces which of the following antibiotics? |
| A. | Cephalosporins |
| B. | Cycloserine |
| C. | Bacitracin |
| D. | Vancomycin |
| Answer» E. | |
| 8. |
Cell-wall biosynthesis is inhibited by antibiotics by inhibiting the biosynthesis of which of the following? |
| A. | lipopolysaccharide |
| B. | cellulose |
| C. | peptidoglycan |
| D. | proteins |
| Answer» D. proteins | |
| 9. |
Bacterial cells grown in a medium exposed to high osmotic pressure, changes shape from rod-shaped to __________ shaped. |
| A. | spherical |
| B. | rod shaped |
| C. | irregular |
| D. | elongated |
| Answer» B. rod shaped | |
| 10. |
POLYMYXINS_INHIBITS_THE_GROWTH_OF_THE_MICROBES_BY_CARRYING_OUT_WHICH_OF_THE_FOLLOWING_ACTIONS??$ |
| A. | inhibition of cell-wall synthesis |
| B. | damage to cytoplasmic membrane |
| C. | inhibition of nucleic acid and protein synthesis |
| D. | inhibition of specific enzyme systems |
| Answer» C. inhibition of nucleic acid and protein synthesis | |
| 11. |
Antibiotic produced by Streptomyces rimosus is _______________$ |
| A. | chlortetracycline |
| B. | oxytetracycline |
| C. | tetracycline |
| D. | doxycycline |
| Answer» C. tetracycline | |
| 12. |
Streptomycin is produced by which of the following organisms?$ |
| A. | Stretomyces noursei |
| B. | Streptomyces nodosus |
| C. | Streptomyces fradiae |
| D. | Streptomyces griseus |
| Answer» E. | |
| 13. |
Tyrocidines are more effective against ___________________ |
| A. | Gram-positive organisms |
| B. | Gram-negative organisms |
| C. | Mycoplasmas |
| D. | Spirochetes |
| Answer» B. Gram-negative organisms | |
| 14. |
Which of the following inhibits protein synthesis by combining with the 50S subunit ribosome? |
| A. | Streptomycin |
| B. | Tetracycline |
| C. | Chloramphenicol |
| D. | Penicillin |
| Answer» D. Penicillin | |
| 15. |
Which of the following interferes with regeneration of the monophosphate form of bactoprenol from the pyrophosphate form? |
| A. | Vancomycin |
| B. | Ampicillin |
| C. | Bacitracin |
| D. | Cephalosporins |
| Answer» D. Cephalosporins | |
| 16. |
Streptomyces orientalis produces which of the following antibiotics? |
| A. | Cephalosporins |
| B. | Cycloserine |
| C. | Bacitracin |
| D. | Vancomycin |
| Answer» E. | |
| 17. |
Ampicillin is a bactericidal antibiotic. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
Benzylpenicillin is the chemical name for which of the following penicillin? |
| A. | Penicillin G |
| B. | Penicillin V |
| C. | Penicillin F |
| D. | Phenethicilin |
| Answer» B. Penicillin V | |
| 19. |
Which of the following does not affect the activity of penicillin? |
| A. | bile |
| B. | hydrochloric acid |
| C. | cysteine |
| D. | sodium hydroxide |
| Answer» B. hydrochloric acid | |
| 20. |
The crystalline sodium or potassium salts are slightly soluble in ___________ |
| A. | ether |
| B. | dioxane |
| C. | water |
| D. | chloroform |
| Answer» E. | |
| 21. |
Structurally all penicillins have only beta-lactam present in them. |
| A. | True |
| B. | False |
| Answer» C. | |
| 22. |
Cell-wall biosynthesis is inhibited by antibiotics by inhibiting the biosynthesis of which of the following ? |
| A. | lipopolysaccharide |
| B. | cellulose |
| C. | peptidoglycan |
| D. | proteins |
| Answer» D. proteins | |
| 23. |
Bacterial cells grown in a medium exposed to high osmotic pressure, changes shape from rod-shaped to __________ shaped. |
| A. | spherical |
| B. | rod shaped |
| C. | irregular |
| D. | elongated |
| Answer» B. rod shaped | |