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				This section includes 44 Mcqs, each offering curated multiple-choice questions to sharpen your Graduate Aptitude Test (GATE) knowledge and support exam preparation. Choose a topic below to get started.
| 1. | 
                                    Which of the following capsular polysaccharides is used for preparing vaccine against meningococcal meningitis? | 
                            
| A. | serovar A | 
| B. | serovar B | 
| C. | serovar C | 
| D. | serovar A and C | 
| Answer» E. | |
| 2. | 
                                     The organism causing whooping cough can grow on ordinary culture media. | 
                            
| A. | True | 
| B. | False | 
| Answer» C. | |
| 3. | 
                                     Pontiac fever is a more severe disease than Legionnaires’ disease. | 
                            
| A. | True | 
| B. | False | 
| Answer» C. | |
| 4. | 
                                     Which of the following antibiotics is most effective? | 
                            
| A. | streptomycin | 
| B. | tetracycline | 
| C. | gentamicin | 
| D. | ampicillin | 
| Answer» D. ampicillin | |
| 5. | 
                                    Which disease is caused by P. pseudomallei organism? | 
                            
| A. | melioidosis | 
| B. | diarrhea | 
| C. | gastroenteritis | 
| D. | typhoid | 
| Answer» B. diarrhea | |
| 6. | 
                                     In which body part does the C. jejuni causes infection? | 
                            
| A. | mouth | 
| B. | stomach | 
| C. | small and large intestine | 
| D. | limbs | 
| Answer» D. limbs | |
| 7. | 
                                    Which of the following terms stand for damage to the spinal cord during tertiary stage of syphilis? | 
                            
| A. | Lymphadenopathy | 
| B. | Malaise | 
| C. | Paresis | 
| D. | Tabes dorsalis | 
| Answer» E. | |
| 8. | 
                                    Syphilis is caused by which of the following organism? | 
                            
| A. | Treponema pallidum | 
| B. | Treponema pertenue | 
| C. | Treponema endemicum | 
| D. | Treponema carateum | 
| Answer» B. Treponema pertenue | |
| 9. | 
                                    Which among the following species causes tuberculosis? | 
                            
| A. | Mycobacterium leprae | 
| B. | Mycobacterium kansasii | 
| C. | Mycobacterium bovis | 
| D. | Mycobacterium ulcerans | 
| Answer» D. Mycobacterium ulcerans | |
| 10. | 
                                    Schick Test is used for detection of which of the following disease? | 
                            
| A. | Diphtheria | 
| B. | Tuberculosis | 
| C. | Erythrasma | 
| D. | Botulism | 
| Answer» B. Tuberculosis | |
| 11. | 
                                     Erythrasma is caused by which of the following microorganism? | 
                            
| A. | Corynebacterium diphtheriae | 
| B. | Corynebacterium ulcerans | 
| C. | Corynebacterium minutissimum | 
| D. | Listeria monocytogenes | 
| Answer» D. Listeria monocytogenes | |
| 12. | 
                                    Which of the following inactivates IgA antibodies? | 
                            
| A. | Cord factor | 
| B. | Diphthin | 
| C. | Neuroaminidase | 
| D. | K antigens | 
| Answer» C. Neuroaminidase | |
| 13. | 
                                    Toxin A involved in pseudomembranous colitis is a type of _______________ | 
                            
| A. | endotoxin | 
| B. | enterotoxin | 
| C. | cytotoxin | 
| D. | neurotoxin | 
| Answer» C. cytotoxin | |
| 14. | 
                                    Patients with botulism are treated with monovalent antitoxin | 
                            
| A. | True | 
| B. | False | 
| Answer» C. | |
| 15. | 
                                     Which serovar of C. botulinum occurs mainly in the sediments of the Great Lakes? | 
                            
| A. | A | 
| B. | B | 
| C. | E | 
| D. | F | 
| Answer» D. F | |
| 16. | 
                                    Which of the following temperature is suitable for multiplication of clostridia spores? | 
                            
| A. | 109 to116 degree F | 
| B. | 100 degree F | 
| C. | -2 to 16 degree F | 
| D. | 30-40 degree F | 
| Answer» B. 100 degree F | |
| 17. | 
                                     What pressure of oxygen is used in the treatment involving the use of hyperbaric oxygen? | 
                            
| A. | 1 | 
| B. | 5 | 
| C. | 100 | 
| D. | 3 | 
| Answer» E. | |
| 18. | 
                                    __________________ is a hyaluronidase that may aid invasiveness of C.perfringens. | 
                            
| A. | alpha toxin | 
| B. | theta toxin | 
| C. | µ toxin | 
| D. | √ toxin | 
| Answer» D. √ toxin | |
| 19. | 
                                    Clostridium perfringens type A occurs as a natural flora of ______________ | 
                            
| A. | stomach | 
| B. | mouth | 
| C. | intestine | 
| D. | eyes | 
| Answer» D. eyes | |
| 20. | 
                                    Booster immunizations should be given every 10 years. | 
                            
| A. | True | 
| B. | False | 
| Answer» B. False | |
| 21. | 
                                    Which of the following organisms produces neurotoxin as a virulence factor? | 
                            
| A. | Bacillus anthracis | 
| B. | Clostridium tetani | 
| C. | Streptococcus pneumoniae | 
| D. | Staphylococcus aureus | 
| Answer» C. Streptococcus pneumoniae | |
| 22. | 
                                    Which drug is used for treatment of anthrax? | 
                            
| A. | erythromycin | 
| B. | penicillin | 
| C. | tetracycline | 
| D. | ampicillin | 
| Answer» C. tetracycline | |
| 23. | 
                                     Which of the following is a major virulence factor of Streptococcus pneumoniae? | 
                            
| A. | polysaccharide capsule | 
| B. | M protein | 
| C. | streptolysin O | 
| D. | streptolysin S | 
| Answer» B. M protein | |
| 24. | 
                                     Puerperal fever is a streptococcal infection of the ______________ | 
                            
| A. | kidney | 
| B. | skin | 
| C. | uterus | 
| D. | heart | 
| Answer» D. heart | |
| 25. | 
                                    Which of the following immunity is protective against infection by S.pyogenes? | 
                            
| A. | cell-mediated immunity | 
| B. | antigen-antibody immunity | 
| C. | humoral immunity | 
| D. | no cure present | 
| Answer» D. no cure present | |
| 26. | 
                                    Scarlet fever is similar to the pharyngitis in all respects. | 
                            
| A. | True | 
| B. | False | 
| Answer» C. | |
| 27. | 
                                    Which of the following microbe does not belong to Group D enterococci group? | 
                            
| A. | S. faecalis | 
| B. | S. faecium | 
| C. | S. durans | 
| D. | S. bovis | 
| Answer» E. | |
| 28. | 
                                    Streptococus pyogenes comprises which Lancefield group? | 
                            
| A. | A | 
| B. | B | 
| C. | C | 
| D. | D | 
| Answer» B. B | |
| 29. | 
                                    Antibiotics can easily reach the staphylococci. | 
                            
| A. | True | 
| B. | False | 
| Answer» C. | |
| 30. | 
                                    Which of the following microorganism causes lesions in the form of abscesses? | 
                            
| A. | Staphylococcus aureus | 
| B. | Streptococcus pyogenes | 
| C. | Streptococcus pneumoniae | 
| D. | Clostridium perfringens | 
| Answer» B. Streptococcus pyogenes | |
| 31. | 
                                    Which of the following toxins cause damage to the tissue cells by its phospholipase action? | 
                            
| A. | alpha toxin | 
| B. | delta toxin | 
| C. | protein A | 
| D. | coagulase | 
| Answer» C. protein A | |
| 32. | 
                                    Which of the following strains causes acute gastroenteritis in newborns and infants? | 
                            
| A. | Enteropathogenic strains | 
| B. | Enteroinvasive strains | 
| C. | Enterotoxigenic strains | 
| D. | Both enteropathogenic and enterotoxigenic | 
| Answer» B. Enteroinvasive strains | |
| 33. | 
                                    Thayer-Martin medium is used for isolation of organism for which disease? | 
                            
| A. | diphtheria | 
| B. | meningococcal meningitis | 
| C. | gonorrhea | 
| D. | gastroenteritis | 
| Answer» D. gastroenteritis | |
| 34. | 
                                     Which of the following capsular polysaccharides is used for preparing vaccine against meningococcal meningitis? | 
                            
| A. | serovar A | 
| B. | serovar B | 
| C. | serovar C | 
| D. | serovar A and C | 
| Answer» E. | |
| 35. | 
                                    The organism causing whooping cough can grow on ordinary culture media. | 
                            
| A. | True | 
| B. | False | 
| Answer» C. | |
| 36. | 
                                    Which drug is used for treatment of brucellosis in humans? | 
                            
| A. | Erythromycin | 
| B. | Tetracycline | 
| C. | Carbenicillin | 
| D. | Gentamicin | 
| Answer» C. Carbenicillin | |
| 37. | 
                                    Which of the following microorganism occurs in swine? | 
                            
| A. | Brucella melitensis | 
| B. | Brucella abortus | 
| C. | Brucella suis | 
| D. | Legionella pneumophila | 
| Answer» D. Legionella pneumophila | |
| 38. | 
                                    Pontiac fever is a more severe disease than Legionnaires’ disease | 
                            
| A. | True | 
| B. | False | 
| Answer» C. | |
| 39. | 
                                    Which of the following antibiotics is most effective? | 
                            
| A. | streptomycin | 
| B. | tetracycline | 
| C. | gentamicin | 
| D. | ampicillin | 
| Answer» D. ampicillin | |
| 40. | 
                                     Which disease is caused by P. pseudomallei organism? | 
                            
| A. | melioidosis | 
| B. | diarrhea | 
| C. | gastroenteritis | 
| D. | typhoid | 
| Answer» B. diarrhea | |
| 41. | 
                                    In which body part does the C. jejuni causes infection? | 
                            
| A. | mouth | 
| B. | stomach | 
| C. | small and large intestine | 
| D. | limbs | 
| Answer» D. limbs | |
| 42. | 
                                    Which of the following is a specific test for detecting antitreponemal antibodies? | 
                            
| A. | VDRL | 
| B. | RPR | 
| C. | TPH | 
| D. | Widal Test | 
| Answer» D. Widal Test | |
| 43. | 
                                     Which of the following terms stand for damage to the spinal cord during tertiary stage of syphilis? | 
                            
| A. | Lymphadenopathy | 
| B. | Malaise | 
| C. | Paresis | 
| D. | Tabes dorsalis | 
| Answer» E. | |
| 44. | 
                                     Syphilis is caused by which of the following organism? | 
                            
| A. | Treponema pallidum | 
| B. | Treponema pertenue | 
| C. | Treponema endemicum | 
| D. | Treponema carateum | 
| Answer» B. Treponema pertenue | |