An acid-fast bacillus is recovered from a bronchial washing on Lowenstein-Jensen medium after 18 days at 35C with CO2. Initially the colonies are buff, raised, and rough when grown in the dark.
After exposure to light, no change in pigmentation is noted. On examination at 10X magnification, the colonies reveal serpentine cording. Which of the following biochemical test reactions will confirm the identity of the most likely etiologic agent?
A) Niacin and nitrate positive B) Niacin positive and nitrate negative
C) Niacin negative and nitrate positive D) Niacin and nitrate negative
Question 2
Which of the following antibiotic classes acts on the organism's protein synthesis?
A) Glycopeptides B) Beta-lactams C) Aminoglycosides D) Carbapenems
Stars and the Interstellar Medium
Which Medium FRIES would you eat?
The Structure of an Amino Acid
Humburger is a good source of niacin , vitamin B6 and pantothenic acid
Acid–Base Balance
Acid–Base Balance