A metagenomic study from a never-before-seen type of gingival infection indicates the presence of large numbers of archaea. Which of the following would be a good practice to isolate this organism?
A. Incubate the isolation medium adjacent to a bright full-spectrum light.
B. Incubate the isolation medium at about 90°C.
C. Adjust the pH of the medium to below 5.
D. Use an anaerobic medium and incubate in a sealed container.
Answer: D
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Studies of ribosomal RNA (rRNA) sequences indicate that ____ are more closely related to each other
than either one is to ____.
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