Thiobacillus species are acidophilic chemolithotrophs capable of autotrophic growth. They perform the dissimilative oxidation of H2S, So, thiosulfate, or Fe+2
Diagram or explain how Thiobacillus species obtain carbon and energy for growth and predict what type of environment they would be found in.
What will be an ideal response?
Answer: Thiobacillus species obtain carbon for growth from carbon dioxide, thus they do not require organic carbon - such as sugars - for growth. Energy is generated by the transfer of electrons from H2S, So, thiosulfate, or Fe+2 to oxygen. The transfer of electrons through an electron transport chain generates a proton motive force that subsequently drives ATP production. The metabolism makes them well-adapted for acidic, aerobic environments that are high in reduced sulfur and iron species, such as acid mine drainage or seeps and springs that contain the reduced chemical species that they use as electron donors. The environments they survive in do not need to have a source of organic carbon, but they do need to be aerobic.
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