Lecture 4 Flashcards
What characteristic arrangement do Staphylococcus species exhibit under the microscope?
A. Chains
B. Pairs
C. Clusters
D. Single cells
C. Clusters
Which toxin associated with Staphylococcus aureus is responsible for scalded skin syndrome?
A. Enterotoxin
B. Exfoliative toxin
C. Toxic shock syndrome toxin
D. Hemolysin
B. Exfoliative toxin
Staphylococcus epidermidis is best known for its role in:
A. Food poisoning
B. Toxic shock syndrome
C. Opportunistic infections associated with implanted medical devices
D. Necrotizing fasciitis
C. Opportunistic infections associated with implanted medical devices
What major characteristic differentiates Streptococcus pneumoniae from Viridans streptococci?
A. Ability to cause dental caries
B. Sensitivity to optochin
C. Ability to cause strep throat
D. Beta-hemolysis
B. Sensitivity to optochin
Neisseria meningitidis, a gram-negative cocci, is typically transmitted through:
A. Blood transfusions
B. Contaminated food
C. Respiratory droplets
D. Direct skin contact
C. Respiratory droplets
Which clinical condition is commonly associated with Neisseria gonorrhoeae?
A. Meningitis
B. Gonorrhea
C. Dental caries
D. Otitis media
B. Gonorrhea
What distinguishes Neisseria species from many other Gram-negative bacteria?
A. Lack of a cell wall
B. Diplococcus arrangement
C. Ability to form spores
D. Lack of flagella
B. Diplococcus arrangement
Which of the following diseases is NOT typically associated with Neisseria meningitidis?
A. Meningococcal meningitis
B. Waterhouse-Friderichsen syndrome
C. Gonorrhea
D. Septicemia
C. Gonorrhea
The capsule found in Neisseria meningitidis functions primarily to:
A. Assist in attachment to host cells
B. Protect against desiccation
C. Protect against phagocytosis
D. Act as a reserve food source
C. Protect against phagocytosis
Streptococcus pyogenes (group A strep) is responsible for which of the following complications?
A. Rheumatic fever
B. Scarlet fever
C. Post-streptococcal glomerulonephritis
D. All of the above
D. All of the above
Which enzyme differentiates Staphylococcus aureus from other staphylococci?
A. Catalase
B. Coagulase
C. Oxidase
D. Hyaluronidase
B. Coagulase
Which Streptococcus species is associated with newborn infections?
A. Streptococcus pneumoniae
B. Streptococcus pyogenes
C. Streptococcus agalactiae (group B strep)
D. Streptococcus mutans
C. Streptococcus agalactiae (group B strep)
Neisseria gonorrhoeae is characterized by its:
A. Resistance to many common antibiotics
B. Ability to form endospores
C. Lack of a cell wall
D. Unique carbohydrate metabolism
A. Resistance to many common antibiotics
The primary pathogenic mechanism of Neisseria meningitidis involves:
A. Production of a polysaccharide capsule that resists phagocytosis
B. Destruction of host cells via toxins
C. Invasion and lysis of red blood cells
D. Interference with the host immune system
A. Production of a polysaccharide capsule that resists phagocytosis
Which of the following best describes the hemolysis pattern of Streptococcus pneumoniae on blood agar?
A. Alpha-hemolysis (partial hemolysis creating a greenish discoloration)
B. Beta-hemolysis (complete hemolysis creating a clear zone)
C. Gamma-hemolysis (no hemolysis)
D. Delta-hemolysis (double zone of hemolysis)
A. Alpha-hemolysis (partial hemolysis creating a greenish discoloration)
