Discussion
The current genus name of a saccharolytic group of Bacteroides is
Answer: A
Correct answer: Prevotella
When the old genus Bacteroides was dismembered, the pigmented species were divided by their ability to ferment sugars. The saccharolytic ones, chiefly the old B. melaninogenicus, became Prevotella, while the asaccharolytic ones, chiefly B. gingivalis and B. asaccharolyticus, became Porphyromonas. Only the B. fragilis group retained the name Bacteroides. The distinction is worth holding by its root: saccharo- for sugar-fermenting Prevotella, porphyro- for the porphyrin pigment of the asaccharolytic group.
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