Gram-Positive Bacilli MCQs

Gram-Positive Bacilli MCQs

  1. Which of the following is a characteristic feature of Gram-positive bacilli?
    • a) Thin peptidoglycan layer
    • b) Thick peptidoglycan layer ✅
    • c) Presence of an outer membrane
    • d) Lipopolysaccharide-rich cell wall

  2. Which Gram-positive bacillus is known for causing anthrax?
    • a) *Clostridium perfringens*
    • b) *Listeria monocytogenes*
    • c) *Bacillus anthracis* ✅
    • d) *Corynebacterium diphtheriae*

  3. *Clostridium botulinum* is known for producing which potent toxin?
    • a) Diphtheria toxin
    • b) Botulinum toxin ✅
    • c) Anthrax toxin
    • d) Tetanus toxin

  4. Which of the following Gram-positive bacilli is a spore-forming bacterium?
    • a) *Listeria monocytogenes*
    • b) *Bacillus cereus* ✅
    • c) *Actinomyces israelii*
    • d) *Nocardia asteroides*

  5. *Listeria monocytogenes* is primarily associated with which type of infections?
    • a) Respiratory infections
    • b) Gastrointestinal infections
    • c) Neurological infections
    • d) Dermatological infections

  6. Which Gram-positive bacillus causes gas gangrene?
    • a) *Bacillus anthracis*
    • b) *Clostridium perfringens* ✅
    • c) *Listeria monocytogenes*
    • d) *Corynebacterium diphtheriae*

  7. What is the primary mode of transmission for *Corynebacterium diphtheriae*?
    • a) Ingestion of contaminated food
    • b) Respiratory droplets ✅
    • c) Direct skin contact
    • d) Insect bites

  8. Which Gram-positive bacillus is known for its ability to grow at cold temperatures (psychrophilic)?
    • a) *Bacillus cereus*
    • b) *Listeria monocytogenes* ✅
    • c) *Clostridium difficile*
    • d) *Corynebacterium diphtheriae*

  9. Which enzyme test is used to differentiate *Bacillus* species from other Gram-positive bacilli?
    • a) Catalase test ✅
    • b) Coagulase test
    • c) Oxidase test
    • d) Urease test

  10. *Clostridium tetani* causes which of the following diseases?
    • a) Diphtheria
    • b) Tetanus ✅
    • c) Anthrax
    • d) Botulism

  11. What characteristic appearance does *Corynebacterium diphtheriae* have on Gram staining?
    • a) Clustered cocci
    • b) Club-shaped bacilli in a palisade arrangement ✅
    • c) Long chains of bacilli
    • d) Spiral-shaped bacilli

  12. Which of the following is a common feature of the genus *Bacillus*?
    • a) Non-spore-forming
    • b) Facultative anaerobes ✅
    • c) Capsule production
    • d) Acid-fast bacilli

  13. *Nocardia* species are Gram-positive bacilli known for causing which type of infections?
    • a) Skin and pulmonary infections ✅
    • b) Gastrointestinal infections
    • c) Urinary tract infections
    • d) Cardiovascular infections

  14. Which Gram-positive bacillus is known for producing enterotoxins leading to food poisoning?
    • a) *Corynebacterium diphtheriae*
    • b) *Bacillus cereus* ✅
    • c) *Clostridium tetani*
    • d) *Listeria monocytogenes*

  15. *Clostridium difficile* is primarily associated with which clinical condition?
    • a) Urinary tract infections
    • b) Pseudomembranous colitis ✅
    • c) Meningitis
    • d) Osteomyelitis

  16. Which of the following is a characteristic feature of *Bacillus anthracis*?
    • a) Non-spore-forming
    • b) Produces a poly-D-glutamic acid capsule ✅
    • c) Strictly anaerobic
    • d) Produces urease

  17. Which of the following is a common feature of *Clostridium* species?
    • a) Aerobic growth
    • b) Non-spore-forming
    • c) Anaerobic growth ✅
    • d) Produces oxidase

  18. Which of the following is a characteristic feature of *Listeria monocytogenes*?
    • a) Strictly aerobic
    • b) Produces catalase and oxidase ✅
    • c) Non-motile
    • d) Produces urease

  19. Which of the following is a characteristic feature of *Corynebacterium diphtheriae*?
    • a) Non-motile
    • b) Produces a toxin that inhibits protein synthesis ✅
    • c) Strictly anaerobic
    • d) Produces oxidase

  20. Which of the following is a characteristic feature of *Nocardia* species?
    • a) Strictly aerobic
    • b) Partially acid-fast ✅
    • c) Non-motile
    • d) Produces urease

  21. Which of the following is a characteristic feature of *Actinomyces* species?
    • a) Strictly aerobic
    • b) Facultative anaerobes ✅
    • c) Non-motile
    • d) Produces oxidase

  22. Which of the following is a characteristic feature of *Mycobacterium* species?
    • a) Strictly aerobic
    • b) Acid-fast ✅
    • c) Non-motile
    • d) Produces urease

  23. Which of the following is a characteristic feature of *Streptomyces* species?
    • a) Strictly aerobic
    • b) Produces antibiotics ✅
    • c) Non-motile
    • d) Produces urease

  24. Which of the following is a characteristic feature of *Propionibacterium* species?
    • a) Strictly aerobic
    • b) Produces propionic acid ✅
    • c) Non-motile
    • d) Produces oxidase

  25. Which of the following is a characteristic feature of *Rothia* species?
    • a) Strictly aerobic
    • b) Facultative anaerobes ✅
    • c) Non-motile
    • d) Produces urease

  26. Which of the following is a characteristic feature of *Tsukamurella* species?
    • a) Strictly aerobic
    • b) Produces catalase and oxidase ✅
    • c) Non-motile
    • d) Produces urease

  27. Which of the following is a characteristic feature of *Arthrobacter* species?
    • a) Strictly aerobic
    • b) Facultative anaerobes ✅
    • c) Non-motile
    • d) Produces oxidase

  28. Which of the following is a characteristic feature of *Micrococcus* species?
    • a) Strictly aerobic
    • b) Produces catalase and oxidase ✅
    • c) Non-motile
    • d) Produces urease

  29. Which of the following is a characteristic feature of *Kocuria* species?
    • a) Strictly aerobic
    • b) Facultative anaerobes ✅
    • c) Non-motile
    • d) Produces oxidase

  30. Which of the following is a characteristic feature of *Dermacoccus* species?
    • a) Strictly aerobic
    • b) Produces catalase and oxidase ✅
    • c) Non-motile
    • d) Produces urease

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