Micro Practice Questions Flashcards
These are some Micro questions that could be on the MT/ASCP exam.
Which of the following groups of specimens would be acceptable for anaerobic culture?
Pleural fluid, brain abscess fluid
Answer choices:
a. vaginal swab, eye swab
b. intraoral surface swab, leg tissue
c. pleural fluid, brain abscess fluid
d. urine, sputum
Inside the body - anaerobic so think inside brain would be good place for anaerobes to be
The proper blood-to-broth ratio for blood cultures to reduce the antibacterial effect of serum in adults is:
1:10
An antibiotic used to suppress or kill contaminating fungi in media is:
a. amphotericin B and penicillin
b. chloramphenicol
c. cycloheximide
d. streptomycin
Answer: cycloheximide
* Remember -MIDE think fungus!!
A 21 year old patient presents with pharyngitis. A throat swab is collected and submitted for anaerobic culture. This specimen should be:
REJECTED as unacceptable
No swabs for anaerobic cultures!!!
Acceptable specimen sources for culture of anaerobic bacteria includes:
a. sputum
b. stool
c. suprapubic bladder aspiration
d. vaginal
C. Suprapubic bladder aspiration - This would most likely facilitate growth of an anaerobe
The primary isolation of Neisseria gonorrhoeae requires:
Carbon dioxide
When processing a patient specimen for Gram stain and culture, the proper use of a biological safety cabinet includes:
c. not using an heat generating equipment such as open flames
A Gram stain of organisms on Loeffler agar showed pleomorphic GPR. The organism should be subcultured to:
Potassium tellurite
A diagnosis of GC in females is best made from:
An endocervical culture
Which of the following organisms is, to date, considered universally susceptible to penicillin?
Streptococcus pyogenes
A gram stain performed on a sputum revealed gram negative diplococci with PMNs. Oxidase testing is positive and carb degradation tests are inert. The organism is:
Moraxella catarrhalis
The most critical distinction between Staphylococcus aureus and other staph is:
Coagulase production
Which organism commonly causes food poisoning by consumption of foods containing excessive population of organisms or performed enterotoxin?
Bacillus Cereus
A beta hemolytic strep that is bacitracin sensitive and CAMP negative:
Group A
Characteristically enterococci:
Are relatively resistant to penicillin
The best procedure to differentiate Listeria monocytogenes from Corynebacterium sp. is:
How many hours after eating contaminated food do initial symptoms of staph food poisoning typically occur?
The primary isolation of Neisseria gonorrhoeae requires:
Listeria can be confused with some streptococci because of its hemolysis and because it is:
Which of the following may be used as a positive control organism for the bile esculin test?
