Thiobacillus denitrificans is a species of bacteria that get its energy from carbon dioxide and inorganic compounds such as nitrogen in its environment. it is used in bioremediation (natural cleansing) of groundwater that contains excess nitrate, allowing the nitrates to be removed. how does thiobacillus denitrificans in bioremediating groundwater? a. nitrification b. denitrification c. nitrogen fixation d. decomposition

The correct answer is B. denitrification.

Thiobacillus denitrificans are gram-negative chemolithoautotroph i.e., they obtain energy from the oxidation of inorganic compounds such as sulphur, nitrogen etc and uses carbon dioxide as a source of carbon for growth.

It couples the oxidation of sulphur compounds (inorganic) with the reduction of nitrogen compounds such as nitrate, nitrite etc. It results in the formation nitrogen gas ().

The overall reaction can be summarized as:

SO_{4}^{-2} + N_{2} + C_{5}H_{7}O_{2}N (biomass)+ H^{+} + H_{2}O" class="latex-formula" id="TexFormula2" src="https://tex.z-dn.net/?f=H_%7B2%7DS%20%2B%20HS%5E%7B-%7D%20%2B%20NO_%7B3%7D%5E%7B-%7D%20%2B%20CO_%7B2%7D%20%2B%20HCO_%7B3%7D%5E%7B-%7D%20%2B%20NH_%7B4%7D%5E%7B%2B%7D%20%3E%20SO_%7B4%7D%5E%7B-2%7D%20%2B%20N_%7B2%7D%20%2B%20C_%7B5%7DH_%7B7%7DO_%7B2%7DN%20%28biomass%29%2B%20H%5E%7B%2B%7D%20%2B%20H_%7B2%7DO" title="H_{2}S + HS^{-} + NO_{3}^{-} + CO_{2} + HCO_{3}^{-} + NH_{4}^{+} > SO_{4}^{-2} + N_{2} + C_{5}H_{7}O_{2}N (biomass)+ H^{+} + H_{2}O">

amber has allowed scientists to study dna that has been preserved over millions of years.

thinking it would be physical characteristics