Question

Some hyperthermophilic organisms that grow in highly acidic $\left(p{H}_2\right)$ habitats belong to two groups

• A. Cyanobacteria and diatoms
• B. Protists and mosses
• C. Liverworts and yeasts
• D. Eubacteria and archaea

Answer 1

The correct option is D Eubacteria and archaea

• Many thermophiles are archaea, while thermophilic eubacteria are suggested to have been among the earliest bacteria.
• Many of these require elemental sulfur for growth. Some are anaerobes, that use the sulfur as an electron acceptor during cellular respiration.
• Some are lithotrophs, that oxidize sulfur to sulfuric acid, thus requiring the microorganism to be adapted to very low pH as well. These organisms are inhabitants of hot, sulfur-rich environments such as hot springs and geysers etc. Option D is correct.