Question

in a thioglycolate broth tube, where would you expect to see the growth of an obligate anaerobe?
slightly below the surface
only near the surface
evenly throughout the tube
at the bottom of the tube
question 8 (1 point)
the term aerotolerant anaerobe refers to an organism that ______________.
is killed by oxygen
does not use oxygen but tolerates it
requires more oxygen than is present in air
tolerates normal atmospheric nitrogen gas

Explanation:

Obligate anaerobes cannot survive in the presence of oxygen. In a thioglycolate broth tube, the bottom has the least oxygen, so they grow at the bottom. Aerotolerant anaerobes do not use oxygen for metabolism but can tolerate its presence.

Answer:

1. D. at the bottom of the tube
2. B. does not use oxygen but tolerates it