Which of the following is the group of archaea that can use CO2 as their final electron acceptor

Which of the following is the group of archaea that can use...

Which of the following is the group of archaea that can use $\mathrm{CO}_{2}$ as their final electron acceptor during anaerobic respiration, producing $\mathrm{CH}_{4} ?$
a. methylotrophs
b. methanotrophs
c. methanogens
d. anoxygenic photosynthesizers

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Key Concepts

Archaea

Archaea are a domain of single-celled microorganisms that are distinct from bacteria and eukaryotes. They often inhabit extreme environments, and many have unique metabolic pathways, such as anaerobic respiration and methanogenesis, which allow them to thrive under conditions where oxygen is absent.

Anaerobic Respiration

Anaerobic respiration is a form of respiration that occurs in the absence of oxygen. Organisms performing anaerobic respiration use alternative molecules as the final electron acceptors in their electron transport chains, allowing for energy extraction through processes that differ from aerobic respiration.

Electron Acceptors

In cellular respiration, electron acceptors are compounds that receive electrons during the electron transport chain. In anaerobic respiration, organisms utilize electron acceptors other than oxygen, such as carbon dioxide, nitrate, or sulfate, to drive the production of energy.

Methanogenesis

Methanogenesis is a metabolic process that occurs in certain archaea, where carbon dioxide is used as the final electron acceptor to produce methane. This anaerobic process is critical in environments such as wetlands and the guts of ruminants, contributing to the global methane cycle.

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