Biology
Grade-10
Easy
Question
What are ammonia oxidizers and nitrogen oxidizers?
- Gram-positive chemolithotrophs
- Gram-negative photolithotrophs
- Gram-positive photolithotrophs
- Gram-negative chemolithotrophs
Hint:
Ammonia oxidizers are microorganisms that generate energy solely by the oxidation of ammonia to nitrite.
The correct answer is: Gram-negative chemolithotrophs
- Ammonium and nitrite oxidizers are the microorganisms that are members of the genus Nitrospira and have a higher affinity for ammonia than all studied ammonia-oxidizing bacteria and archaea but a low affinity for nitrite.
- The COMAMMOX metabolism is highly efficient, producing a high biomass yield per mol of ammonia oxidized.
- Nitrite-oxidizers mainly comprise six bacterial genera: Nitrobacter, Nitrospira, Nitrotoga, Nitrococcus, Nitrospina, and Nitrolancetus, which are affiliated with Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, and Deltaproteobacteria, as well as the phyla Chloroflexi (Nitrolancetus) and Nitrospirae.
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