A microbe that grows only at the bottom of a tube of thioglycollate medium is probably a(n)
A) facultative anaerobe.
B) obligate anaerobe.
C) obligate aerobe.
D) microaerophile.
E) aerotolerant anaerobe.

Question

Quizplus · Accepted Answer

Thioglycollate medium is used to test the oxygen requirements of microorganisms. A microbe that grows only at the bottom of the tube is likely an obligate anaerobe, as it cannot tolerate oxygen and grows only in the absence of it.

A Microbe That Grows Only at the Bottom of a Tube