MTQap_Qrationale

Which of the following does NOT match? (1) Spirochetes = Spiral (2) Bacilli = Spherical (3) Gram-positive = Blue to purple (4) Gram-negative = Pink

• a. 1 only
• b. 2 only
• c. 3 only
• d. 4 only

Staphylococcal leucocidin ____ is an exotoxin lethal to polymorphonuclear leukocytes. It has been implicated as contributing to the invasiveness of the organism by suppressing phagocytosis and has been associated with severe cutaneous infections and necrotizing pneumonia.

• a. Alpha hemolysin
• b. Beta hemolysin
• c. Delta hemolysin
• d. Panton - valentine leukocidin

All statements are true regarding JEMBEC system, except:

• a. Can be used as a transport system for vaginal discharge
• b. Contains selective agar and a N2
• c. Can be used as a transport system for urethral discharge
• d. A and C

Inhibitors contained in Salmonella-Shigella agar:

• a. Gentian violet
• b. Sodium azide
• c. Bile salts and brilliant green
• d. Potassium tellurite

Phenylethyl alcohol is used to:

• a. Inhibit gram-negative bacteria
• b. Inhibit gram-positive bacteria
• c. Both A and B
• d. None of the above

Which of the following is/are TRUE with Thayer-Martin agar? I. Thayer-Martin agar is a selective media used for the isolation of Neisseria gonorrhoeae II. It uses a combination of Vancomycin, Colistin, and Nystatin (VCN) ti select out N. gonorrhoeae III. Modified Thayer Martin agar uses trimethoprim in addition. IV. Thayer-Martin agar is a nonselective media used for the isolation of Neisseria gonorrhoeae

• a. I only
• b. I and II
• c. I, II, and III
• d. I, II, III, and IV

Which media should be used to recover Bordetella pertussis from a nasopharyngeal specimen?

• a. CHocolate agar
• b. Blod agar
• c. Bordet-Gengou agar
• d. MacConkey Agar

Hemolytic Streptococci require blood to support their growth. What type of media should be used to cultivate such bacteria?

• a. Differential media
• b. Enriched media
• c. General purpose media
• d. Selective media

These media allow only the growth of desired organisms while inhibiting the others.

• a. Differential media
• b. Enrichment media
• c. General purpose media
• d. Selective media

These media can be used to distinguish lactose-fermenting and non-lactose-fermenting bacteria in terms of color reaction.

• a. Differential media
• b. Enrichment media
• c. General purpose media
• d. Selective media