Question

A microbe that can tolerate the presence or absence of oxygen is which of the following?

a. obligate anaerobe

b. facultative anaerobe

c. obligate aerobe

d. microaerophile

Answer 1

The organism which can tolerate the presence or the absence of the oxygen are the facultative anaerobes.

Actually these bacteria are aerobic in nature but in the absence of the oygen too they can survive.

Facultative means optional, so the aerobic bacteria which turn into anaerobic condition optionally are called facultative anaerobes.

Obligate means strict so Obligate Aerobes and Anaerobes are bacteria which survive in presence and absence of oxygen respectively.

Microaerophiles are the bacteria which require lower levels of oxygen than the normal levels of the atmosphere.