Question

Which prokaryote is most likely to be found both in sewage treatment plants and in the intestines of cattle?

A) Cyanobacteria

B) Methanogens

C) Thin cell wall bacteria

D) Bacteria with plasmids

E) Thick cell wall bacteria

Answer 1

Correct answer is B) Methanogens.

Because Archaebacteria are contrasted with the Eubacteria, from which they differ biochemically in the arrangement of the bases in their ribosomal RNA and in the composition of their plasma membranes and cell walls. There are three major known groups of Archaebacteria: methanogens, halophiles, and thermophiles. The methanogens are anaerobic bacteria that produce methane. They are found in sewage treatment plants, bogs, and the intestinal tracts of ruminants. Ancient methanogens are the source of natural gas. Halophiles are bacteria that thrive in high salt concentrations such as those found in salt lakes or pools of sea water.