Medical Technologist Test Microbiology 3

Question 1

Which organism is identified by its characteristic 'safety pin' bipolar staining appearance?

Accepted Answer

Yersinia pestis

Answer

Francisella tularensis

Answer

Brucella melitensis

Answer

Burkholderia pseudomallei

Question 2

Obligate intracellular parasites that cause atypical pneumonia and cannot be grown on standard agar include which organism?

Accepted Answer

Chlamydophila pneumoniae

Answer

Mycoplasma pneumoniae

Answer

Legionella pneumophila

Answer

Coxiella burnetii

Question 3

Which selective and differential medium is used to isolate Salmonella and Shigella from stool?

Accepted Answer

Hektoen enteric agar

Answer

Blood agar

Answer

Columbia CNA agar

Answer

Buffered charcoal yeast extract

Question 4

The Quellung reaction (capsular swelling) is used to identify and serotype which organism?

Accepted Answer

Streptococcus pneumoniae

Answer

Staphylococcus aureus

Answer

Neisseria meningitidis

Answer

Haemophilus influenzae

Question 5

Which viral detection method directly identifies viral antigens in a patient specimen without culture?

Accepted Answer

Direct fluorescent antibody (DFA) test

Answer

Viral culture

Answer

PCR

Answer

Serology (antibody titer)

Question 6

Beta-hemolysis on blood agar combined with bacitracin sensitivity indicates which streptococcal group?

Accepted Answer

Group A Streptococcus (S. pyogenes)

Answer

Group B Streptococcus

Answer

Group D Streptococcus

Answer

Viridans streptococci