In identification of mycobacterial isolates, the niacin test involves
A) the accumulation of niacin in the medium in which the organism is growing.
B) the metabolism of niacin to nicotinic acid by enzymatic action.
C) testing the isolate for susceptibility to niacin.
D) utilization of niacin in metabolic pathways to produce nicotinic acid.
Correct Answer:
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Q25: The nonpathogenic Mycobacterium commonly found in tap
Q26: One drawback associated with the fluorochrome stain
Q29: The type of specimen collected for mycobacterial
Q30: The stain that does not require heating
Q31: Specimens for Mycobacterium studies that require concentration,
Q34: Sodium hydroxide, Zephiran-trisodium phosphate, N-acetyl-L-cysteine-NaOH, and oxalic
Q36: When culturing for Mycobacterium,rapid-growers usually produce colonies
Q37: For reliable results, the niacin test should
Q38: Optimal conditions for most mycobacterial cultures are
A)25°
Q39: On Gram stain,mycobacteria appear as:
A)slender,well-stained gram-positive bacilli.
B)poorly
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