Slow-growing NTM whose colonies produce no pigment,whether they are grown in the dark or the light,are referred to as:
A)scotochromogens.
B)photochromogens.
C)nonphotochromogens.
D)chromogenicums.

Question

Quizplus · Accepted Answer

Species of mycobacteria synthesize carotenoids (i.e. ,a group of pigments that are yellow to red)in varying amounts and are categorized into three groups based on the production of these pigments-nonphotochromogens,photochromogens,and scotochromogens.The nonphotochromogens are slow-growing NTM whose colonies produce no pigment whether they are grown in the dark or the light.The photochromogens are slow-growing NTM whose colonies become pigmented when exposed to light.The scotochromogens are slow-growing NTM whose colonies are pigmented when grown in the dark or the light.

Slow-Growing NTM Whose Colonies Produce No Pigment,whether They Are Grown