Gram-Positive Bacilli MCQs
- 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
- Which Gram-positive bacillus is known for causing anthrax?
- a) *Clostridium perfringens*
- b) *Listeria monocytogenes*
- c) *Bacillus anthracis* ✅
- d) *Corynebacterium diphtheriae*
- *Clostridium botulinum* is known for producing which potent toxin?
- a) Diphtheria toxin
- b) Botulinum toxin ✅
- c) Anthrax toxin
- d) Tetanus toxin
- Which of the following Gram-positive bacilli is a spore-forming bacterium?
- a) *Listeria monocytogenes*
- b) *Bacillus cereus* ✅
- c) *Actinomyces israelii*
- d) *Nocardia asteroides*
- *Listeria monocytogenes* is primarily associated with which type of infections?
- a) Respiratory infections
- b) Gastrointestinal infections
- c) Neurological infections
- d) Dermatological infections
- Which Gram-positive bacillus causes gas gangrene?
- a) *Bacillus anthracis*
- b) *Clostridium perfringens* ✅
- c) *Listeria monocytogenes*
- d) *Corynebacterium diphtheriae*
- 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
- 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*
- 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
- *Clostridium tetani* causes which of the following diseases?
- a) Diphtheria
- b) Tetanus ✅
- c) Anthrax
- d) Botulism
- 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
- 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
- *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
- 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*
- *Clostridium difficile* is primarily associated with which clinical condition?
- a) Urinary tract infections
- b) Pseudomembranous colitis ✅
- c) Meningitis
- d) Osteomyelitis
- 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
- Which of the following is a common feature of *Clostridium* species?
- a) Aerobic growth
- b) Non-spore-forming
- c) Anaerobic growth ✅
- d) Produces oxidase
- 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
- 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
- Which of the following is a characteristic feature of *Nocardia* species?
- a) Strictly aerobic
- b) Partially acid-fast ✅
- c) Non-motile
- d) Produces urease
- Which of the following is a characteristic feature of *Actinomyces* species?
- a) Strictly aerobic
- b) Facultative anaerobes ✅
- c) Non-motile
- d) Produces oxidase
- Which of the following is a characteristic feature of *Mycobacterium* species?
- a) Strictly aerobic
- b) Acid-fast ✅
- c) Non-motile
- d) Produces urease
- Which of the following is a characteristic feature of *Streptomyces* species?
- a) Strictly aerobic
- b) Produces antibiotics ✅
- c) Non-motile
- d) Produces urease
- Which of the following is a characteristic feature of *Propionibacterium* species?
- a) Strictly aerobic
- b) Produces propionic acid ✅
- c) Non-motile
- d) Produces oxidase
- Which of the following is a characteristic feature of *Rothia* species?
- a) Strictly aerobic
- b) Facultative anaerobes ✅
- c) Non-motile
- d) Produces urease
- 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
- Which of the following is a characteristic feature of *Arthrobacter* species?
- a) Strictly aerobic
- b) Facultative anaerobes ✅
- c) Non-motile
- d) Produces oxidase
- 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
- Which of the following is a characteristic feature of *Kocuria* species?
- a) Strictly aerobic
- b) Facultative anaerobes ✅
- c) Non-motile
- d) Produces oxidase
- 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
