It has been estimated that 99% of intestinal bacteria are
A) obligate aerobes.
B) facultative anaerobes.
C) obligate anaerobes.
D) facultative aerobes.
E) thermophiles.

Question

Quizplus · Accepted Answer

The presence of intestinal bacteria indicates an anaerobic environment. Obligate aerobes require oxygen to grow, and facultative aerobes can grow with or without oxygen. However, obligate anaerobes cannot survive in the presence of oxygen, and since the intestinal environment is anaerobic, it is likely that a majority of the bacteria would be obligate anaerobes.

It Has Been Estimated That 99% of Intestinal Bacteria Are