Question

A microbe that lives only in the absence of oxygen is called a(n):

a) Aerobe
b) Anaerobe
c) Autotroph
d) Heterotroph

Answer 1

An organism that lives only in the absence of oxygen is called an obligate anaerobe. They use anaerobic respiration or fermentation to obtain energy and lack the enzymes that protect cells from oxygen radicals.

Step-by-step explanation:

An organism that lives only in the absence of oxygen is called an obligate anaerobe. These organisms cannot survive in the presence of oxygen and use anaerobic respiration or fermentation to obtain energy. They lack the enzymes that protect cells from oxygen radicals, which makes oxygen lethal for them.