Microbiology Quiz

Which family does Streptococcus spp. and Enterococcus spp. belong to?

• Family Streptococcaceae

• Family Staphylococcaceae

• Family Streptococcaceae

• Family Enterococcaceae

What is the characteristic of staphylococci and micrococci in terms of catalase reaction?

• Bubble formation

• Partial hemolysis of RBCs

• No bubble formation

• Greenish discoloration

Which Streptococcus spp. is associated with the Lancefield group A?

• Streptococcus pyogenes

• Streptococcus agalactiae

• Streptococcus dysgalactiae

• Streptococcus equi

What is the virulence factor of Streptococcus pyogenes that resists phagocytosis and adheres to mucosal cells?

• Hyaluronic Acid Capsule

• Streptolysin O

• Protein F

• M Protein

Which Streptococcus spp. is the number one cause of pneumonia in immunocompromised patients?

• Streptococcus agalactiae

• Streptococcus pyogenes

• Viridans streptococci

• Streptococcus pneumoniae

What is the characteristic of Enterococcus spp. in terms of growth conditions?

• Require low temperature

• Require acidic pH

• Require alkaline pH

• Require high temperature

Which Streptococcus-like bacteria require sulfhydryl compounds for growth?

• Pediococcus

• Aerococcus spp.

• Gemella spp.

• Leuconostoc spp.

What is the characteristic of Gemella spp. in terms of morphology?

• Gram-positive bacilli

• Gram-positive cocci

• Gram-negative cocci

• Gram-negative bacilli

Which biochemical test is used to differentiate Leuconostoc spp. from enterococci?

• 0.04% tellurite tolerance

• Acid production from CHO

• Pyruvate utilization

• Arginine hydrolysis

What is the characteristic of Pediococcus in terms of resistance?

• Sensitive to erythromycin

• Intrinsically resistant to amoxicillin

• Intrinsically resistant to vancomycin

• Sensitive to penicillin