MCQOPTIONS
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MCQOPTIONS
This section includes 51 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
and can be differentiated on the basis of which of the following tests? |
| A. | Decarboxylation of ornithine |
| B. | Fermentation of sucrose and cellobiose |
| C. | Motility at 22°C |
| D. | All of these |
| Answer» E. | |
| 2. |
Selective media for the isolation of is |
| A. | Hektoen enteric agar |
| B. | agar |
| C. | Xylose lysine deoxycholate agar |
| D. | All of these |
| Answer» E. | |
| 3. |
The technique(s), used for the assay of heat-labile enterotoxin produced by , is/are |
| A. | Steroid production in Yl mouse adrenal cell culture |
| B. | Morphological changes in Chinese hamster ovary |
| C. | Enzyme-linked immunosorbent assay |
| D. | All of these |
| Answer» E. | |
| 4. |
Verotoxin 1 of is similar to |
| A. | cholera toxin |
| B. | shiga toxin |
| C. | heat-stable enterotoxin of |
| D. | heat-labile enterotoxin of |
| Answer» C. heat-stable enterotoxin of | |
| 5. |
Heat-labile enterotoxin of activates |
| A. | guanylate cyclase |
| B. | adenylate cyclase |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 6. |
Heat-stable enterotoxin of activates |
| A. | adenylate cyclase |
| B. | guanylate cyclase |
| C. | both of the above |
| D. | none of these |
| Answer» C. both of the above | |
| 7. |
Which of the following species/subspecies of produce indole? |
| A. | subspecies |
| B. | subspecies |
| C. | subspecies |
| Answer» E. | |
| 8. |
Which of the following serotypes of does not produce HS? |
| A. | Both (a) and (b) |
| B. | None of these |
| Answer» D. | |
| 9. |
The reaction(s) that is/are usually positive in , is/ are |
| A. | Glucose fermentation |
| B. | Indole reaction |
| C. | Methyl red reaction |
| D. | All of these |
| Answer» E. | |
| 10. |
Which of the following determine the pathogenicity of ? |
| A. | V and W antigens |
| B. | F1 envelope antigen |
| C. | Production of pigmented colonies on haemin containing media |
| D. | All of these |
| Answer» E. | |
| 11. |
An enrichment medium for the isolation of is |
| A. | Alkaline peptone water |
| B. | Terathionate broth |
| C. | Selenite F broth |
| D. | none of these |
| Answer» D. none of these | |
| 12. |
Which of the following serotypes of Salmonella does not produce H2S? |
| A. | <i>S choleraesuis</i> |
| B. | <i>S paratyphi A</i> |
| C. | Both (a) and (b) |
| D. | None of these |
| Answer» D. None of these | |
| 13. |
Xylose lysine deoxycholate (XLD) agar is better selective medium than the deoxycholate citrate agar (DCA) because |
| A. | it is selective |
| B. | it imparts better growth |
| C. | it contains high salt concentration |
| D. | it is less inhibitory to |
| E. | <i>S. Dysentriae and S. flexneri</i> |
| Answer» E. <i>S. Dysentriae and S. flexneri</i> | |
| 14. |
Which of the following is the commonest species of Salmonella for causing zoonotic disease? |
| A. | <i>S Indiana</i> |
| B. | <i>S newport</i> |
| C. | <i>S typhimurium</i> |
| D. | <i>S enteritidis</i> |
| Answer» D. <i>S enteritidis</i> | |
| 15. |
Which of the following media is selective for Salmonella? |
| A. | Thiosulphate citrate bile salt agar |
| B. | Wilson and Blair's brilliant-green bismuth sulphite agar medium |
| C. | Bile salt agar |
| D. | All of the above |
| Answer» C. Bile salt agar | |
| 16. |
Selective media for the isolation of Shigella is |
| A. | Hektoen enteric agar |
| B. | <i>Salmonella-Shigella</i> |
| C. | agar |
| D. | Xylose lysine deoxycholate agar |
| E. | All of these |
| Answer» E. All of these | |
| 17. |
The technique(s), used for the assay of heat-labile enterotoxin produced by Escherichia coli, is/are |
| A. | Steroid production in Yl mouse adrenal cell culture |
| B. | Morphological changes in Chinese hamster ovary |
| C. | Enzyme-linked immunosorbent assay |
| D. | All of these |
| Answer» E. | |
| 18. |
The media which serve(s) as enrichment media for Salmonella is/are |
| A. | Tetrathionate broth |
| B. | Brilliant green tetrathionate broth |
| C. | Selenite-F broth |
| D. | All of these |
| Answer» E. | |
| 19. |
Primarily human pathogenic bacteria is/are , |
| A. | <i>Salmonella typhi</i> |
| B. | <i>S paratyphi A</i> |
| C. | <i>S paratyphi B</i> |
| D. | all of these |
| Answer» E. | |
| 20. |
The bacteria which produce(s) -galactosidase is/are |
| A. | <i>Citrobacter</i> |
| B. | <i>Enterohacter</i> |
| C. | <i>Serratia</i> |
| D. | all of these |
| Answer» E. | |
| 21. |
Which of the following property(ies), shown by the organisms belong(s) to the family Enterobacteriaceae? |
| A. | They are catalase-positive |
| B. | They are oxidase-negative |
| C. | They ferment glucose |
| D. | All of these |
| Answer» E. | |
| 22. |
In Widal test, the significant titre for O agglutinins is generally |
| A. | 1:50 or more |
| B. | 1:100 or more |
| C. | 1:150 or more |
| D. | 1:2.00 or more |
| Answer» C. 1:150 or more | |
| 23. |
Bipolar staining is characteristic of |
| A. | <i>Yersinia pestis</i> |
| B. | <i>Proteus mirabilis</i> |
| C. | <i>Pseudomonas aeruginosa</i> |
| D. | all of these |
| Answer» B. <i>Proteus mirabilis</i> | |
| 24. |
Spirochaetes exhibit |
| A. | corkscrew-like rotatory movement |
| B. | flexion and extension motility |
| C. | translatory motion |
| D. | all of the above |
| Answer» E. | |
| 25. |
Species of Shigella which is predominant in India is |
| A. | <i>S sonnei</i> |
| B. | <i>S dysenteriae</i> |
| C. | <i>S boydii</i> |
| D. | <i>S flexneri</i> |
| Answer» E. | |
| 26. |
Which of the following disease is caused by Yersinia enterocolitica in man? |
| A. | Gastroenteritis |
| B. | Mesenteric lymphadenitis |
| C. | Septicaemia |
| D. | All of these |
| Answer» E. | |
| 27. |
Which of the following determine the pathogenicity of Yersinia pestis? |
| A. | V and W antigens |
| B. | F1 envelope antigen |
| C. | Production of pigmented colonies on haemin containing media |
| D. | All of these |
| Answer» E. | |
| 28. |
The most common cause of urinary tract infection in the community is |
| A. | <i>Klebsiella pneumoniae</i> |
| B. | <i>Proteus vulgaris</i> |
| C. | <i>Escherichia coli</i> |
| D. | <i>Citrobacter freundii</i> |
| Answer» D. <i>Citrobacter freundii</i> | |
| 29. |
Enterobacter can be differentiated from Klebsiella by |
| A. | ornithine positivity |
| B. | motility |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 30. |
Heat-labile enterotoxin of Escherichia coli activates |
| A. | guanylate cyclase |
| B. | adenylate cyclase |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 31. |
The bacteria that is negative for fermentation of mannitol is |
| A. | <i>S flexneri</i> |
| B. | <i>S boydii</i> |
| C. | <i>S dysenteriae</i> |
| D. | <i>S sonnei</i> |
| Answer» D. <i>S sonnei</i> | |
| 32. |
Prodigiosin (red pigment) is produced by members of genus |
| A. | <i>Hafnia</i> |
| B. | <i>Enterobacter</i> |
| C. | <i>Serratia</i> |
| D. | <i>Cirobacter</i> |
| Answer» D. <i>Cirobacter</i> | |
| 33. |
Which of the following serotypes of Salmonella can cause gastroenteritis? |
| A. | <i>S enteritidis</i> |
| B. | <i>S newport</i> |
| C. | <i>S typhimurium</i> |
| D. | All of these |
| Answer» E. | |
| 34. |
An enrichment medium for the isolation of Shigella is |
| A. | Alkaline peptone water |
| B. | Terathionate broth |
| C. | Selenite F broth |
| D. | none of these |
| Answer» D. none of these | |
| 35. |
Heat-stable enterotoxin of Escherichia coli activates |
| A. | adenylate cyclase |
| B. | guanylate cyclase |
| C. | both of the above |
| D. | none of these |
| Answer» C. both of the above | |
| 36. |
Which of the following(s) bacteria belong to the family Entero-bacteriaceae? |
| A. | <i>Yersinia</i> |
| B. | <i>Shigella</i> |
| C. | <i>Salmonella</i> |
| D. | All of these |
| Answer» E. | |
| 37. |
Transmission of bubonic plague is by |
| A. | rat flea |
| B. | inhalation |
| C. | ingestion |
| D. | all of these |
| Answer» B. inhalation | |
| 38. |
The bacteria, which is more resistant to adverse environmental conditions, is |
| A. | <i>S sonnei</i> |
| B. | <i>S dysenteriae</i> |
| C. | <i>S flexneri</i> |
| D. | <i>S boydii</i> |
| Answer» B. <i>S dysenteriae</i> | |
| 39. |
The reaction(s) that is/are usually positive in Escherichia coli, is/ are |
| A. | Glucose fermentation |
| B. | Indole reaction |
| C. | Methyl red reaction |
| D. | All of these |
| Answer» E. | |
| 40. |
Sylvatic plague occurs in |
| A. | mice |
| B. | squirrels |
| C. | chipmunks |
| D. | all of these |
| Answer» E. | |
| 41. |
Transmission of pneumonic plague from man to man is through |
| A. | inoculation |
| B. | ingestion |
| C. | droplet infection |
| D. | all of these |
| Answer» D. all of these | |
| 42. |
Which of the following genus belongs to family Spirochaetaceae? |
| A. | <i>Treponema</i> |
| B. | <i>Spirochaeta</i> |
| C. | <i>Borrelia</i> |
| D. | All of these |
| Answer» E. | |
| 43. |
Which of the following bacteria is/are known as coliform bacilli? |
| A. | <i>Escherichia</i> |
| B. | <i>Klebsiella</i> |
| C. | <i>Enterobacter</i> |
| D. | All of these |
| Answer» E. | |
| 44. |
The agent(s) which can cause plague is/are |
| A. | <i>Yersinia pestis</i> |
| B. | <i>Proteus mirabilis</i> |
| C. | <i>Pseudomonas aeruginosa</i> |
| D. | All of these |
| Answer» B. <i>Proteus mirabilis</i> | |
| 45. |
In Yersinia pestis, capsule is best demonstrated in cultures grown at |
| A. | 25 C |
| B. | 29 C |
| C. | 37 C |
| D. | 45 C |
| Answer» D. 45 C | |
| 46. |
Which of the following can readily kill Salmonellae? |
| A. | Moist heat at 55 C for 20 min |
| B. | Moist heat at 55 C for 10 min |
| C. | Moist heat at 55 C for 30 min |
| D. | Moist heat at 55 C for 1 hr |
| Answer» E. | |
| 47. |
Example of the pathogenic bacteria is/are |
| A. | <i>L biflexa</i> |
| B. | <i>Lparva</i> |
| C. | <i>Leptospira interrogans</i> |
| D. | All of these |
| Answer» D. All of these | |
| 48. |
Yersinia enterocolitica and Y. pestis can be differentiated on the basis of which of the following tests? |
| A. | Decarboxylation of ornithine |
| B. | Fermentation of sucrose and cellobiose |
| C. | Motility at 22 C |
| D. | All of these |
| Answer» E. | |
| 49. |
In Widal test the significant titres for H agglutinins is |
| A. | 1:50 or more |
| B. | 1:100 ormore |
| C. | 1:200 or more |
| D. | 1:400 or more |
| Answer» D. 1:400 or more | |
| 50. |
Salmonellae can also be killed by |
| A. | pasteurisation |
| B. | chlorination |
| C. | boiling |
| D. | all of these |
| Answer» E. | |