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.
C
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 pig-ments—nonphotochromogens, photochromogens, and scotochromogens. The nonphotochromo-gens 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 pig-mented when exposed to light. The scotochromogens are slow-growing NTM whose colonies are pigmented when grown in the dark or the light.
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Unlike other epithelia the epithelia that make up the capillaries have holes in them called fenestrations.
a. true b. false
In humans, digestion of starch begins in the
a) esophagus. b) duodenum. c) mouth. d) stomach. e) large intestine.
Echinoderms are classified as Bilateria, but although they start out as bilateral larvae, they change into radially symmetrical adults. You might hypothesize that their genes controlling the development of radial symmetry are
A. different from those controlling development of symmetry in all other radially symmetrical animals. B. similar to genes controlling body form in Porifera. C. similar to genes controlling body form in Ctenophora. D. similar to genes controlling body form in Lophotrochozoa. E. similar to a common set of genes controlling body form in Ctenophora and Lophotrochozoa.
The olfactory epithelium is located in the roof of the mouth
____________________ Indicate whether the statement is true or false.