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Thiobacillus is a group of bacteria helpful in carrying out:

1. Nitrogen fixation
2. Chemoautotrophic fixation
3. Nitrification
4. Denitrification

Correct answer: Denitrification

Solution

Thiobacillus species are associated with denitrification, the process in which nitrates are reduced to nitrogen gas under low-oxygen conditions. This is different from nitrification, nitrogen fixation, or general chemoautotrophy.

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