What Makes the Metabolism of Ferroglobus Interesting in the Context

question 69

Multiple Choice

What makes the metabolism of Ferroglobus interesting in the context of evolution?

• A) Ferroglobus is an anaerobic iron-oxidizing chemolithotrophic autotroph that may represent a key metabolism that allowed for the oxidation of ferrous iron without molecular oxygen.
• B) Ferroglobus can use H₂ or H₂S as electron acceptors in its energy metabolism and is thermophilic, thus representing the earliest hypothesized forms of life.
• C) Ferroglobus lacks cell walls and becomes encrusted in oxidized iron, suggesting that it may be an ancestor of other archaeans that lack cell walls.
• D) Ferroglobus is both an iron- and nitrate-reducer and is probably the last common ancestor of all iron- and nitrate-reducing organisms.

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