The Most Common Electron Donor Used Among Hyperthermophilic Archaea Is

Question

The most common electron donor used among hyperthermophilic Archaea is
A) Fe⁺³
B) H₂.
C) SO₄.
D) Sᵒ.

Accepted Answer

The most common electron donor used by hyperthermophilic Archaea is hydrogen gas (H₂). This is because they typically live in environments lacking inorganic electron donors such as oxygen, nitrates, and sulfates. Instead, they use H₂ as an energy source and electron donor in anaerobic respiration. Other electron donors such as Fe⁺³, SO₄, and Sᵒ may also be used by some hyperthermophilic Archaea, but they are not as common as H₂.