Microbiology Quiz

Which of the following is the positive result for the DNase test?

• No clearing

• Dark blue color

• Hydrolysis of the surrounding medium, resulting in a clear zone

• No color change

Cystine-tellurite blood agar plates are recommended for the isolation of:

• Group D streptococci

• S. pyogenes

• S. agalactiae

• C. diphtheriae

The etiologic agent of the majority of adult joint infection is:

• Leuconostoc sp.

• Abiotrophia sp.

• S. pneumoniae

• S. aureus

Which of the following Staphylococci is the cause of urinary tract infection in young females?

• S. saprophyticus

• S. aureus

• S. hominis

• S. epidermidis

What does JEMBEC stand for?

• John E. Martin Biosafety Environmental System

• John E. Martin Biohard Environmental System

• John E. Martin Biolochemical System

• John E. Martin Biological Environmental System

The bile-esculin test is used to differentiate:

• Group A from group B streptococci

• Enterococci from other group D streptococci

• Group D streptococci from other streptococci

• Streptococcus faecalis from Listeria

A Brucella isolate that does not produce H2S, does not require CO2, and is not inhibited by thionin or basic fuchsin is probably which species of Brucella?

• Brucella canis

• Brucella abortus, biotype 1

• Brucella suis, biotype 1

• Brucella melitensis, biotype 1

A gram-negative, fastidious bacillus that has been isolated from air-conditioning towers is:

• Edwardsiella tarda

• Proteus vulgaris

• Brucella abortus

• Legionella pneumophila

Which of the following is NOT gram-negative?

• Branhamella

• Salmonella

• Aeromonas

• Peptococcus

The beta-hemolysis produced by group A Streptococcus seen on the surface of a sheep blood agar plate is primarily the result of streptolysin:

• S

• O

• H

• M