Multiple choice

Nitrogen is a severe chemical in both the protein and DNA. So every living organism should metabolize nitrogen for surviving. Only bacteria and Archaea are capable to convert gaseous nitrogen (N2) to and from soluble ionic compounds, which other organisms may metabolize.

Which of the following bacteria minimizes nitrate to gaseous nitrogen?

  1. Pseudomonas

  2. Azospirillum

  3. Nitrosomonas

  4. Nitrococcus
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Explanation

Pseudomonas minimizes nitrate to gaseous nitrate, which is actually denitrification and is a microorganism facilitated method of nitrate reduction that finally produce molecular nitrogen (N2) via sequence of intermediate gaseous nitrogen oxide products. 

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