Medical Technologist Test Microbiology

Question 1

Which culture medium is selective for gram-negative enteric bacteria?

Accepted Answer

MacConkey agar

Answer

Blood agar

Answer

Chocolate agar

Answer

Sabouraud dextrose agar

Question 2

A positive catalase test followed by a positive coagulase test identifies which organism?

Accepted Answer

Staphylococcus aureus

Answer

Streptococcus pyogenes

Answer

Enterococcus faecalis

Answer

Listeria monocytogenes

Question 3

Which stain is used to visualize acid-fast bacilli such as Mycobacterium tuberculosis?

Accepted Answer

Ziehl-Neelsen (carbol fuchsin) stain

Answer

Gram stain

Answer

India ink

Answer

Silver stain

Question 4

Colonies with a green metallic sheen on EMB agar are characteristic of which organism?

Accepted Answer

Escherichia coli

Answer

Klebsiella pneumoniae

Answer

Pseudomonas aeruginosa

Answer

Proteus mirabilis

Question 5

Which organism is the MOST common cause of community-acquired pneumonia in the US?

Accepted Answer

Streptococcus pneumoniae

Answer

Haemophilus influenzae

Answer

Klebsiella pneumoniae

Answer

Legionella pneumophila

Question 6

A negative urease test, positive indole test, and positive oxidase test best describes which organism?

Accepted Answer

Vibrio cholerae

Answer

Helicobacter pylori

Answer

Proteus mirabilis

Answer

Enterococcus faecalis