In 2012, scientists discovered that colonies of single-celled organisms can be found in high numbers in the human gut. Scientists are particularly concerned with the colonies that produce methane, as methane in the human gut can be linked to constipation and irritable bowel syndrome (IBS). The scientists can classify these colonies as belonging to the domain
A) Archaea.
B) Bacteria.
C) Eukarya.
D) Protista.

Question

Quizplus · Accepted Answer

Methane-producing organisms in the gut are often classified as archaea, a domain of single-celled microorganisms that are genetically and biochemically distinct from bacteria and eukaryotes. This classification is based on the fact that the enzymes involved in methane production are unique to archaea. Therefore, the best choice would be A) Archaea.

In 2012, Scientists Discovered That Colonies of Single-Celled Organisms Can