Discussion
Which lithotrophic bacteria grow aerobically with CO as a sole source of carbon and energy ?
Answer: B
The answer is Pseudomonas carboxydovorans.
Carboxydotrophic bacteria grow aerobically on carbon monoxide as their sole source of carbon and energy, oxidising it with the enzyme CO dehydrogenase. Pseudomonas carboxydovorans, now classified as Oligotropha carboxidovorans, is the classic example.
Alcaligenes eutrophus (printed 'Alkaligenes eutrophas') is a hydrogen-oxidizing bacterium that uses H2 for energy. Thiobacillus thiooxidans oxidizes reduced sulphur compounds, and Nitrobacter winogradskyi oxidizes nitrite to nitrate. None of them lives on CO.
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