MCQOPTIONS
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MCQOPTIONS
This section includes 51 Mcqs, each offering curated multiple-choice questions to sharpen your Staplylococcus knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which drug is used for the treatment of anthrax? |
| A. | erythromycin |
| B. | penicillin |
| C. | tetracycline |
| D. | ampicillin |
| Answer» C. tetracycline | |
| 2. |
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 | |
| 3. |
Puerperal fever is a streptococcal infection of the ______________ |
| A. | kidney |
| B. | skin |
| C. | uterus |
| D. | heart |
| Answer» D. heart | |
| 4. |
All are true about Streptococcus except: |
| A. | M-protein is responsible for the production of mucoid colonies |
| B. | M-protein is responsible for virulence |
| C. | Mucoid colonies are virulent |
| D. | No resistance to penicillin has been reported |
| Answer» B. M-protein is responsible for virulence | |
| 5. |
A person from the village is complaining about the development of pustules. Extract from pus has shown gram-positive cocci, showing hemolysis, catalase -ve, identified as a group of streptococci. The following test is used: |
| A. | Bacitracin sensitivity |
| B. | Novobiocin sensitivity |
| C. | Optochin sensitivity |
| D. | Hemolysis |
| Answer» B. Novobiocin sensitivity | |
| 6. |
Which component of St.pyogenes has cross-reactivity with the synovium of humans? |
| A. | Capsular hyaluronic acid |
| B. | Cell proteins |
| C. | Group A carbohydrate antigens |
| D. | Peptidoglycan |
| Answer» B. Cell proteins | |
| 7. |
Eight months after prosthetic valve replacement, the most common organism causing infective endocarditis is: |
| A. | Staph.epidermidis |
| B. | Strep.Viridans |
| C. | Staph.aureus |
| D. | HACEK |
| Answer» B. Strep.Viridans | |
| 8. |
A boy with skin ulcer on leg, culture revealed beta hemolysis. School physician said that similar hemolysis was seen in the organism from a sore throat, what is the similarity between both? |
| A. | A protein is the same for both |
| B. | C carbohydrate antigen is different |
| C. | C carbohydrate antigen is the same |
| D. | Strain causing both are same |
| Answer» D. Strain causing both are same | |
| 9. |
In the case of neonatal meningitis, the etiologic bacteria was found to have properties of -hemolysis, bacitracin resistance, CAMP positive. Which of the following is the most likely causative agent? |
| A. | S.pyogenes |
| B. | S.agalactiae |
| C. | S.pneumoniae |
| D. | E.faecalis |
| Answer» C. S.pneumoniae | |
| 10. |
Streptococci causing dental caries: |
| A. | Streptococci equisimilis |
| B. | Streptococci mutans |
| C. | Streptococci pneumonia |
| D. | Streptococci Bovis |
| Answer» C. Streptococci pneumonia | |
| 11. |
Which is false regarding gram-positive cocci? |
| A. | Staph. saprophytic causes UTI females |
| B. | Micrococci are oxidase positive |
| C. | Most enterococci are sensitive to penicillin |
| D. | Pneumococci are capsulated |
| Answer» D. Pneumococci are capsulated | |
| 12. |
A patient of RHD developed infective endocarditis after dental extraction. The most likely organism causing this is: |
| A. | Streptococcus viridans |
| B. | Streptococcus pneumonia |
| C. | Streptococcus pyogenes |
| D. | S. aureus |
| Answer» B. Streptococcus pneumonia | |
| 13. |
Most common cause of artificial heart valve infection: in the first 3 months |
| A. | Staphylococcus aureus |
| B. | Streptococcus mutans |
| C. | Staph epidermidis |
| D. | Pneumococcus |
| Answer» D. Pneumococcus | |
| 14. |
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 | |
| 15. |
Scarlet fever is similar to the pharyngitis in all respects. |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
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. | |
| 17. |
Streptococus pyogenes comprises which Lancefield group? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 18. |
Antibiotics can easily reach the staphylococci. |
| A. | True |
| B. | False |
| Answer» C. | |
| 19. |
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 | |
| 20. |
Blood culture is positive in which infection of staph.aureus: |
| A. | TSS |
| B. | SSSS |
| C. | Infective endocarditis |
| D. | Impetigo |
| Answer» D. Impetigo | |
| 21. |
Staphylococcal scalded skin syndrome is caused by: |
| A. | Hemolysin |
| B. | Coagulase |
| C. | Enterotoxin |
| D. | Epidermolysis toxin |
| Answer» E. | |
| 22. |
A cook is habitual of nose-picking while cooking. His clients are at risk for food poisoning with: |
| A. | Clostridia difficle |
| B. | Staph aureus |
| C. | Vibrio cholerae |
| D. | Bacillus cereus |
| Answer» C. Vibrio cholerae | |
| 23. |
Catalase positive coagulase-negative -hemolytic bacteria: |
| A. | Strep pyrogens |
| B. | Staph aureus |
| C. | Coagulase-negative staph |
| D. | Enterococci |
| Answer» D. Enterococci | |
| 24. |
Catalase positive, beta-hemolytic-staphylococcus: |
| A. | S aureus |
| B. | S epidermidis |
| C. | S saprophytic |
| D. | None |
| Answer» B. S epidermidis | |
| 25. |
Gas gangrene is most likely associated with infection with: |
| A. | Staphylococcus aureus |
| B. | Clostridium perfringenes |
| C. | Streptococcus pneumoniae |
| D. | Neisseria gonorrhoeae |
| Answer» C. Streptococcus pneumoniae | |
| 26. |
The leading cause of preventable blindness in the world is caused by: |
| A. | Chlamydia trachomatis |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» B. B. | |
| 27. |
Bacterial conjunctivitis (inflammation of the eye conjunctiva) can be caused by: |
| A. | Staphylococcus aureus |
| B. | Streptococcus pneumoniae |
| C. | Pseudomonas aeruginosa |
| D. | All of the above bacteria can cause conjunctivitis |
| Answer» E. | |
| 28. |
The bacteria that multiply in blocked skin pores, metabolize sebum, and can lead to the development of acne are: |
| A. | Pseudomonas aeruginosa |
| B. | Propionibacterium spp. |
| C. | Serratia marcescens |
| D. | Streptococcus pyogenes |
| Answer» C. Serratia marcescens | |
| 29. |
Burn patients often develop nosocomial infection caused by: |
| A. | Staphylococcus epidermis |
| B. | Staphylococcus aureus |
| C. | Pseudomonas aeruginosa |
| D. | Candida albicans |
| Answer» D. Candida albicans | |
| 30. |
Test to differentiate staphylococci from micrococci: |
| A. | Catalase test |
| B. | Coagulase test |
| C. | Novobiocin sensitivity |
| D. | Oxidation fermentation |
| Answer» E. | |
| 31. |
Most common site for staphylococcus carrier: |
| A. | Skin |
| B. | Nose |
| C. | Oropharynx |
| D. | Perineum |
| Answer» C. Oropharynx | |
| 32. |
Best available option to prevent MRSA infection in a hospital: |
| A. | Prophylactic antibiotics |
| B. | Fumigation of wards |
| C. | Proper handwashing |
| D. | Use of disinfectants |
| Answer» D. Use of disinfectants | |
| 33. |
Staphylococcus aureus does not cause which of the following skin in infection: |
| A. | Ecthyma gangrenous |
| B. | Bullous impetigo |
| C. | Botryomycosis |
| D. | Cellulitis |
| Answer» B. Bullous impetigo | |
| 34. |
Coagulase test differentiates: |
| A. | Staphylococci from streptococci |
| B. | Streptococci from enterococci |
| C. | Staph aureus from staph epidermis |
| D. | Staph epidermidis from staph saprophyticus |
| Answer» D. Staph epidermidis from staph saprophyticus | |
| 35. |
Protein A of staphylococcus binds to: |
| A. | IgA |
| B. | IgG |
| C. | IgD |
| D. | IgE |
| Answer» C. IgD | |
| 36. |
For phage typing, how many phages of staphylococcus aureus are used: |
| A. | 12 |
| B. | 15 |
| C. | 20 |
| D. | 28 |
| Answer» E. | |
| 37. |
All cause Fournier gangrene except: |
| A. | Staphylococcus |
| B. | Streptococcus |
| C. | Clostridium |
| D. | Bacteroides |
| Answer» D. Bacteroides | |
| 38. |
Food poisoning case with diarrhea within 6 hours: |
| A. | Staph aureus |
| B. | Cl.perfringens |
| C. | Cl.botulinum |
| D. | V.cholerae |
| Answer» B. Cl.perfringens | |
| 39. |
Which of the following Staphylococcal haemolysins does not cause lysis of human RBCs? |
| A. | haemolysin |
| B. | haemolysin |
| C. | haemolysin |
| D. | haemolysin |
| Answer» D. haemolysin | |
| 40. |
Staphylococcal food poisoning usually manifests itself following ingestion of contaminated food after |
| A. | 2-6 hours |
| B. | 8-12 hours |
| C. | 12-18 hours |
| D. | 18-36 hours |
| Answer» B. 8-12 hours | |
| 41. |
The pus producing skin infections (pyoderma) can be caused by |
| A. | Staphylococci |
| B. | Streptococci |
| C. | Corynebacteria |
| D. | All of these |
| Answer» E. | |
| 42. |
Which of the following is not the characteristics of impetigo? |
| A. | Common in children |
| B. | Can be caused by Staphylococcus aureus |
| C. | Can be caused by Streptococcus pyogenes |
| D. | Can be caused by pseudomonads |
| Answer» E. | |
| 43. |
Scalded skin syndrome is caused by exotoxin (exfoliatins) produced by: |
| A. | |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» D. D. | |
| 44. |
Which of the following microorganisms causes scarlet fever? |
| A. | Streptococcus pyogens |
| B. | Pseudomonas aeruginosa |
| C. | Staphylococcus aureus |
| D. | Propionibacterium acne |
| Answer» B. Pseudomonas aeruginosa | |
| 45. |
A massive lesion caused by the spread of Staphylococcus aureus infection (often on the neck and upper back) is called: |
| A. | Boil |
| B. | Abscess |
| C. | Furuncle |
| D. | Carbuncle |
| Answer» D. Carbuncle | |
| 46. |
Most strains of Staphylococcus aureus indicate |
| A. | phosphatase production |
| B. | a golden-yellow pigment |
| C. | -haemolysis on sheep blood agar |
| D. | all of the above |
| Answer» E. | |
| 47. |
The most common cause of cystitis (after Escherichia coli) in healthy sexually active women is |
| A. | Staphylococcus saprophyticus |
| B. | Proteus mirabilis |
| C. | Pseudomonas aeruginosa |
| D. | Klebsiella pneumoniae |
| Answer» B. Proteus mirabilis | |
| 48. |
Which of the following Staphylococcal haemolysins does not possess leucocidal activity? |
| A. | haemolysin |
| B. | haemolysin |
| C. | haemolysin |
| D. | haemolysin |
| Answer» D. haemolysin | |
| 49. |
The toxin of Staphylococcus aureus that may result into scalded skin syndrome is |
| A. | Enterotoxin |
| B. | Leucocidin |
| C. | Epidermolytic toxin |
| D. | Haemolysin |
| Answer» D. Haemolysin | |
| 50. |
Most common nosocomial infection is: |
| A. | Staph aureus |
| B. | E.coli |
| C. | Legionella |
| D. | Strep pneumonia |
| Answer» B. E.coli | |