KROK 1 2008 – Question 42 · KROK (Medicine) · Microbiology, Virology, and Immunology
Microscopy of stained (Ziehl-Neelsen staining) smears taken from the sputum of a patient with chronic pulmonary disease revealed red bacilli. What property of tuberculous bacillus was shown up?
- A. Alkali resistance
- B. Capsule formation
- C. Sporification
- D. Acid resistance
- E. Alcohol resistance
Hint
Consider what feature of the lipid-rich mycobacterial wall lets the bacilli hold the red dye even after the decolorizing step of the staining procedure.
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